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Indebtedness (Narrative) (Details)
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Oct. 19, 2016
USD ($)
Oct. 31, 2016
EUR (€)
loan_agreement
Apr. 30, 2016
USD ($)
loan_agreement
Apr. 30, 2016
EUR (€)
May 31, 2014
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2014
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
shares
Dec. 31, 2016
EUR (€)
Apr. 30, 2016
EUR (€)
loan_agreement
Debt Instrument [Line Items]                        
Interest Paid               $ 58,800,000 $ 63,000,000 $ 68,400,000    
Repayments of convertible debt               0 0 $ 201,200,000    
Outstanding letters of credit               17,100,000 17,500,000      
Net Investment Hedging | Designated as Hedging Instrument                        
Debt Instrument [Line Items]                        
Notional amount of foreign currency derivatives               329,200,000 338,900,000   € 312,000,000  
Cash Flow Hedging | Designated as Hedging Instrument                        
Debt Instrument [Line Items]                        
Notional amount of foreign currency derivatives               1,661,400,000        
Cash Flow Hedging | Interest Rate Swap | Designated as Hedging Instrument                        
Debt Instrument [Line Items]                        
Notional amount of foreign currency derivatives               $ 329,200,000     € 312,000,000  
Derivative, fixed interest rate               0.3315%     0.3315%  
Fair Value Hedging | Interest Rate Swap | Designated as Hedging Instrument                        
Debt Instrument [Line Items]                        
Notional amount of foreign currency derivatives                 300,000,000.0      
Deferred gain on hedge termination           $ 7,300,000            
unamortized portion of deferred hedge gain               $ 6,600,000        
Amortization of deferred hedge gains               700,000        
1.056% Senior term loan due 2020                        
Debt Instrument [Line Items]                        
Debt, face amount | €                     € 200,000,000.0  
Senior Notes               $ 211,000,000 $ 217,200,000   € 200,000,000.0  
Debt Interest Rate               1.056% 1.056%   1.056%  
Line of Credit | Interest Accrual, Option Two                        
Debt Instrument [Line Items]                        
Variable rate               0.50%        
Line of Credit | Interest Accrual, Option Three                        
Debt Instrument [Line Items]                        
Variable rate               1.00%        
Line of Credit | Minimum | Interest Accrual, Option One                        
Debt Instrument [Line Items]                        
Variable rate               1.00%        
Line of Credit | Minimum | Interest Accrual, Option Three | Variable Basis, Additional Margin                        
Debt Instrument [Line Items]                        
Variable rate               0.00%        
Line of Credit | Maximum | Interest Accrual, Option One                        
Debt Instrument [Line Items]                        
Variable rate               1.75%        
Line of Credit | Maximum | Interest Accrual, Option Three | Variable Basis, Additional Margin                        
Debt Instrument [Line Items]                        
Variable rate               0.25%        
Line of Credit | Revolving Credit Facility                        
Debt Instrument [Line Items]                        
Maximum borrowing capacity               $ 800,000,000        
Long-term line of credit               0 $ 0      
Remaining borrowing capacity               800,000,000        
Credit facility, expires 2020                        
Debt Instrument [Line Items]                        
Debt, face amount | €   € 375,000,000                 € 395,600,000  
Number Of Loan Agreements Entered | loan_agreement   7                    
Line of credit               329,200,000 338,900,000   312,000,000  
Proceeds from issuance of debt $ 409,500,000 € 373,200,000                    
4½% Senior term loan due 2016                        
Debt Instrument [Line Items]                        
Debt, face amount               225,400,000     € 200,000,000.0  
Senior Notes               $ 0 $ 217,200,000      
Debt Interest Rate               4.50% 4.50%   4.50%  
Proceeds from issuance of debt     $ 112,200,000 € 99,600,000                
5 7/8% Senior notes due 2021                        
Debt Instrument [Line Items]                        
Debt, face amount               $ 306,600,000.0        
Senior Notes               $ 306,600,000 $ 297,400,000      
Debt Interest Rate               5.875% 5.875%   5.875%  
Redemption percentage               100.00%        
5 7/8% Senior notes due 2021 | Interest Accrual, Option Two                        
Debt Instrument [Line Items]                        
Variable rate               0.50%        
Senior Unsecured Term Loan Due April 26, 2021, First Loan                        
Debt Instrument [Line Items]                        
Debt, face amount | €                       € 100,000,000
Senior Unsecured Term Loan Due April 26, 2021, Second Loan                        
Debt Instrument [Line Items]                        
Debt, face amount | €                       200,000,000.0
Senior Unsecured Term Loan Due April 26, 2021, Total                        
Debt Instrument [Line Items]                        
Debt, face amount     $ 316,500,000                 € 300,000,000
Senior Unsecured Term Loan Due April 26, 2021, Total | Minimum                        
Debt Instrument [Line Items]                        
Variable rate               1.00%        
Senior Unsecured Term Loan Due April 26, 2021, Total | Maximum                        
Debt Instrument [Line Items]                        
Variable rate               1.75%        
1 1/4percent Convertible Senior Subordinated Notes Due December 15, 2036                        
Debt Instrument [Line Items]                        
Debt Interest Rate               1.25% 1.25%   1.25%  
Debt repurchased             $ 49,700,000          
Convertible notes converted (less than)         $ 151,500,000              
Conversion of 1 1/4% convertible senior subordinated notes, shares issued (in shares) | shares                   1,437,465    
Excess conversion value of the notes                   $ 81,000,000    
Repayments of convertible debt                   201,200,000    
Interest expense on debt                   $ 900,000    
Rabobank | Senior Unsecured Term Loan Due April 26, 2021, Total                        
Debt Instrument [Line Items]                        
Number Of Loan Agreements Entered | loan_agreement     2                 2