| 
                Total assets
             | 
                        
                2.5B
             | 
                        
                2.6B
             | 
                        
                2.5B
             | 
                        
                2.5B
             | 
                    
                
                        | 
                Current assets
             | 
                        
                2.0B
             | 
                        
                2.0B
             | 
                        
                2.0B
             | 
                        
                1.9B
             | 
                    
                
                        | 
                Cash
             | 
                        
                —
             | 
                        
                1.0B
             | 
                        
                —
             | 
                        
                1.2B
             | 
                    
                
                        | 
                Cash equivalents
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Cash and cash equivalents
             | 
                        
                910.2M
             | 
                        
                1.0B
             | 
                        
                1.1B
             | 
                        
                1.2B
             | 
                    
                
                        | 
                Other short term investments
             | 
                        
                157M
             | 
                        
                155.2M
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Accounts receivable
             | 
                        
                421.2M
             | 
                        
                399.7M
             | 
                        
                415.6M
             | 
                        
                315.9M
             | 
                    
                
                        | 
                Other receivables
             | 
                        
                15.5M
             | 
                        
                8.0M
             | 
                        
                3.5M
             | 
                        
                1.6M
             | 
                    
                
                        | 
                Inventory
             | 
                        
                468.8M
             | 
                        
                419.6M
             | 
                        
                457.3M
             | 
                        
                360.1M
             | 
                    
                
                        | 
                Prepaid assets
             | 
                        
                27.9M
             | 
                        
                31.1M
             | 
                        
                34.5M
             | 
                        
                19.6M
             | 
                    
                
                        | 
                Restricted cash
             | 
                        
                0
             | 
                        
                1.0M
             | 
                        
                —
             | 
                        
                0
             | 
                    
                
                        | 
                Assets held for sale
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Hedging assets
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Other current assets
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Non current assets
             | 
                        
                519.3M
             | 
                        
                538.1M
             | 
                        
                515.4M
             | 
                        
                580.5M
             | 
                    
                
                        | 
                Properties
             | 
                        
                351.4M
             | 
                        
                96.2M
             | 
                        
                370.7M
             | 
                        
                92.2M
             | 
                    
                
                        | 
                Land and improvements
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Machinery furniture equipment
             | 
                        
                —
             | 
                        
                1.1B
             | 
                        
                —
             | 
                        
                1.1B
             | 
                    
                
                        | 
                Construction in progress
             | 
                        
                22.8M
             | 
                        
                33.9M
             | 
                        
                4.9M
             | 
                        
                26.7M
             | 
                    
                
                        | 
                Leases
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Accumulated depreciation
             | 
                        
                —
             | 
                        
                -1.0B
             | 
                        
                —
             | 
                        
                -955.8M
             | 
                    
                
                        | 
                Goodwill
             | 
                        
                9.7M
             | 
                        
                9.8M
             | 
                        
                12.1M
             | 
                        
                15.1M
             | 
                    
                
                        | 
                Investment properties
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Financial assets
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Intangible assets
             | 
                        
                —
             | 
                        
                9.8M
             | 
                        
                —
             | 
                        
                15.1M
             | 
                    
                
                        | 
                Investments and advances
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Other non current assets
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Total liabilities
             | 
                        
                854.4M
             | 
                        
                865.5M
             | 
                        
                927.4M
             | 
                        
                766.4M
             | 
                    
                
                        | 
                Current liabilities
             | 
                        
                768.3M
             | 
                        
                774.0M
             | 
                        
                821.0M
             | 
                        
                678.0M
             | 
                    
                
                        | 
                Accounts payable
             | 
                        
                333.4M
             | 
                        
                292.3M
             | 
                        
                371.8M
             | 
                        
                227.7M
             | 
                    
                
                        | 
                Accrued expenses
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Short term debt
             | 
                        
                43.4M
             | 
                        
                69.8M
             | 
                        
                38.4M
             | 
                        
                94.0M
             | 
                    
                
                        | 
                Deferred revenue
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Tax payable
             | 
                        
                22.5M
             | 
                        
                31.4M
             | 
                        
                23.6M
             | 
                        
                29.1M
             | 
                    
                
                        | 
                Pensions
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Other current liabilities
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Non current liabilities
             | 
                        
                86.1M
             | 
                        
                91.5M
             | 
                        
                106.5M
             | 
                        
                88.4M
             | 
                    
                
                        | 
                Long term provisions
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Long term debt
             | 
                        
                29.2M
             | 
                        
                31.4M
             | 
                        
                34.9M
             | 
                        
                28.3M
             | 
                    
                
                        | 
                Provision for risks and charges
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Deferred liabilities
             | 
                        
                29.6M
             | 
                        
                28.5M
             | 
                        
                37.4M
             | 
                        
                23.4M
             | 
                    
                
                        | 
                Derivative product liabilities
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Other non current liabilities
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Shareholders equity
             | 
                        
                
             | 
                        
                
             | 
                        
                
             | 
                        
                
             | 
                    
                
                        | 
                Common stock
             | 
                        
                83.3M
             | 
                        
                83.3M
             | 
                        
                83.3M
             | 
                        
                83.3M
             | 
                    
                
                        | 
                Retained earnings
             | 
                        
                1.3B
             | 
                        
                1.4B
             | 
                        
                1.2B
             | 
                        
                1.3B
             | 
                    
                
                        | 
                Other shareholders equity
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Total shareholders equity
             | 
                        
                1.7B
             | 
                        
                1.7B
             | 
                        
                1.6B
             | 
                        
                1.7B
             | 
                    
                
                        | 
                Additional paid in capital
             | 
                        
                251.3M
             | 
                        
                251.3M
             | 
                        
                251.3M
             | 
                        
                251.3M
             | 
                    
                
                        | 
                Treasury stock
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Minority interest
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             |