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Indebtedness (Narrative) (Details)
1 Months Ended 3 Months Ended 12 Months Ended
Oct. 19, 2016
USD ($)
Oct. 31, 2016
EUR (€)
loan_agreement
Apr. 30, 2016
USD ($)
Apr. 30, 2016
EUR (€)
loan_agreement
Jun. 30, 2016
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2017
EUR (€)
Debt Instrument [Line Items]                  
Interest Paid           $ 51,400,000 $ 58,800,000 $ 63,000,000  
Debt, face amount           305,300,000      
Outstanding letters of credit           15,200,000 17,100,000    
Net Investment Hedging | Designated as Hedging Instrument                  
Debt Instrument [Line Items]                  
Notional amount of foreign currency derivatives           374,200,000 329,200,000   € 312,000,000
Cash Flow Hedging | Designated as Hedging Instrument                  
Debt Instrument [Line Items]                  
Notional amount of foreign currency derivatives           1,798,200,000      
Cash Flow Hedging | Interest Rate Swap | Designated as Hedging Instrument                  
Debt Instrument [Line Items]                  
Notional amount of foreign currency derivatives           $ 374,200,000     € 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           5,300,000 6,600,000    
Amortization of deferred hedge gains           1,300,000 700,000    
Senior term loans due between 2019 and 2026                  
Debt Instrument [Line Items]                  
Debt, face amount   € 375,000,000       449,700,000      
Senior Notes           449,700,000 395,600,000    
Number Of Loan Agreements Entered | loan_agreement   7              
Proceeds from issuance of debt $ 409,500,000 € 373,200,000              
1.056% Senior term loan due 2020                  
Debt Instrument [Line Items]                  
Senior Notes           $ 239,800,000 $ 211,000,000   € 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           97,000,000      
Remaining borrowing capacity           703,000,000 $ 800,000,000    
Credit facility, expires 2020                  
Debt Instrument [Line Items]                  
Senior Notes           471,200,000 $ 329,200,000    
Line of credit           $ 374,200,000     € 312,000,000
4½% Senior term loan due 2016                  
Debt Instrument [Line Items]                  
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           $ 305,300,000.0      
Senior Notes           $ 305,300,000 $ 306,600,000    
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   $ 119,900,000      
Senior Unsecured Term Loan Due April 26, 2021, Second Loan                  
Debt Instrument [Line Items]                  
Debt, face amount       200,000,000.0   $ 239,800,000     € 200,000,000.0
Senior Unsecured Term Loan Due April 26, 2021, Total                  
Debt Instrument [Line Items]                  
Debt, face amount | €       € 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%      
Rabobank | Senior Unsecured Term Loan Due April 26, 2021, Total                  
Debt Instrument [Line Items]                  
Number Of Loan Agreements Entered | loan_agreement       2