| 
                Total assets
             | 
                        
                2.1B
             | 
                        
                2.1B
             | 
                        
                2.0B
             | 
                        
                2.0B
             | 
                    
                
                        | 
                Current assets
             | 
                        
                1.1B
             | 
                        
                1.1B
             | 
                        
                1.0B
             | 
                        
                1.0B
             | 
                    
                
                        | 
                Cash
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Cash equivalents
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Cash and cash equivalents
             | 
                        
                605.3M
             | 
                        
                610.3M
             | 
                        
                581.8M
             | 
                        
                570.2M
             | 
                    
                
                        | 
                Other short term investments
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Accounts receivable
             | 
                        
                99.6M
             | 
                        
                84.1M
             | 
                        
                68.4M
             | 
                        
                74.8M
             | 
                    
                
                        | 
                Other receivables
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Inventory
             | 
                        
                372.7M
             | 
                        
                360.6M
             | 
                        
                336.8M
             | 
                        
                325.5M
             | 
                    
                
                        | 
                Prepaid assets
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Restricted cash
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Assets held for sale
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Hedging assets
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Other current assets
             | 
                        
                37.8M
             | 
                        
                31.4M
             | 
                        
                33.7M
             | 
                        
                43.6M
             | 
                    
                
                        | 
                Non current assets
             | 
                        
                1.0B
             | 
                        
                1.0B
             | 
                        
                1.0B
             | 
                        
                1.0B
             | 
                    
                
                        | 
                Properties
             | 
                        
                0
             | 
                        
                0
             | 
                        
                0
             | 
                        
                0
             | 
                    
                
                        | 
                Land and improvements
             | 
                        
                85.9M
             | 
                        
                78.9M
             | 
                        
                77.9M
             | 
                        
                75.0M
             | 
                    
                
                        | 
                Machinery furniture equipment
             | 
                        
                176.2M
             | 
                        
                172.2M
             | 
                        
                158.7M
             | 
                        
                154.4M
             | 
                    
                
                        | 
                Construction in progress
             | 
                        
                16.2M
             | 
                        
                14.5M
             | 
                        
                21.9M
             | 
                        
                21.4M
             | 
                    
                
                        | 
                Leases
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Accumulated depreciation
             | 
                        
                -165.3M
             | 
                        
                -156.0M
             | 
                        
                -149.0M
             | 
                        
                -142.1M
             | 
                    
                
                        | 
                Goodwill
             | 
                        
                791.6M
             | 
                        
                780.7M
             | 
                        
                783.5M
             | 
                        
                786.4M
             | 
                    
                
                        | 
                Investment properties
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Financial assets
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Intangible assets
             | 
                        
                64.7M
             | 
                        
                64.7M
             | 
                        
                67.6M
             | 
                        
                70.5M
             | 
                    
                
                        | 
                Investments and advances
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Other non current assets
             | 
                        
                288.6M
             | 
                        
                294.1M
             | 
                        
                287.0M
             | 
                        
                284.3M
             | 
                    
                
                        | 
                Total liabilities
             | 
                        
                578.8M
             | 
                        
                566.0M
             | 
                        
                509.2M
             | 
                        
                535.4M
             | 
                    
                
                        | 
                Current liabilities
             | 
                        
                466.0M
             | 
                        
                451.3M
             | 
                        
                394.2M
             | 
                        
                418.7M
             | 
                    
                
                        | 
                Accounts payable
             | 
                        
                68.2M
             | 
                        
                65.1M
             | 
                        
                44.7M
             | 
                        
                64.3M
             | 
                    
                
                        | 
                Accrued expenses
             | 
                        
                116.3M
             | 
                        
                116.7M
             | 
                        
                122.8M
             | 
                        
                117.7M
             | 
                    
                
                        | 
                Short term debt
             | 
                        
                103.7M
             | 
                        
                106.1M
             | 
                        
                88.2M
             | 
                        
                86.0M
             | 
                    
                
                        | 
                Deferred revenue
             | 
                        
                88.0M
             | 
                        
                82.9M
             | 
                        
                68.4M
             | 
                        
                85.0M
             | 
                    
                
                        | 
                Tax payable
             | 
                        
                48.1M
             | 
                        
                52.6M
             | 
                        
                45.7M
             | 
                        
                40.3M
             | 
                    
                
                        | 
                Pensions
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Other current liabilities
             | 
                        
                41.8M
             | 
                        
                27.9M
             | 
                        
                24.5M
             | 
                        
                25.4M
             | 
                    
                
                        | 
                Non current liabilities
             | 
                        
                112.8M
             | 
                        
                114.7M
             | 
                        
                115.0M
             | 
                        
                116.7M
             | 
                    
                
                        | 
                Long term provisions
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Long term debt
             | 
                        
                24.1M
             | 
                        
                24.8M
             | 
                        
                24.7M
             | 
                        
                24.7M
             | 
                    
                
                        | 
                Provision for risks and charges
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Deferred liabilities
             | 
                        
                7.9M
             | 
                        
                7.4M
             | 
                        
                7.1M
             | 
                        
                7.3M
             | 
                    
                
                        | 
                Derivative product liabilities
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Other non current liabilities
             | 
                        
                80.8M
             | 
                        
                82.5M
             | 
                        
                83.2M
             | 
                        
                84.7M
             | 
                    
                
                        | 
                Shareholders equity
             | 
                        
                
             | 
                        
                
             | 
                        
                
             | 
                        
                
             | 
                    
                
                        | 
                Common stock
             | 
                        
                1.6M
             | 
                        
                1.6M
             | 
                        
                1.6M
             | 
                        
                1.6M
             | 
                    
                
                        | 
                Retained earnings
             | 
                        
                988.0M
             | 
                        
                976.0M
             | 
                        
                965.0M
             | 
                        
                924.4M
             | 
                    
                
                        | 
                Other shareholders equity
             | 
                        
                -14.6M
             | 
                        
                -20.1M
             | 
                        
                -21.0M
             | 
                        
                -13.4M
             | 
                    
                
                        | 
                Total shareholders equity
             | 
                        
                1.6B
             | 
                        
                1.5B
             | 
                        
                1.5B
             | 
                        
                1.5B
             | 
                    
                
                        | 
                Additional paid in capital
             | 
                        
                595.5M
             | 
                        
                586.9M
             | 
                        
                582.7M
             | 
                        
                579.7M
             | 
                    
                
                        | 
                Treasury stock
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Minority interest
             | 
                        
                —
             | 
                        
                —
             | 
                        
                0
             | 
                        
                —
             |