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Indebtedness (Narrative) (Details)
1 Months Ended 3 Months Ended 12 Months Ended
Oct. 19, 2016
USD ($)
Apr. 30, 2016
USD ($)
Apr. 30, 2016
EUR (€)
loan_agreement
Oct. 31, 2016
EUR (€)
loan_agreement
Mar. 31, 2017
USD ($)
Jun. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Mar. 31, 2017
EUR (€)
Dec. 31, 2015
EUR (€)
Dec. 31, 2014
EUR (€)
Debt Instrument [Line Items]                    
Debt instrument, unused borrowing capacity | €                   € 200,000,000.0
Senior notes         $ 518,300,000          
Remaining borrowing capacity on line of credit facility         615,100,000          
Outstanding letters of credit         $ 15,200,000   $ 17,100,000      
4 1/2% Senior Unsecured Term Loan Due 2016 [Member]                    
Debt Instrument [Line Items]                    
Net proceeds from issuance of long term debt   $ 112,200,000 € 99,600,000              
Line of Credit [Member] | Interest Accrual, Option Two [Member]                    
Debt Instrument [Line Items]                    
Margin on variable rate         0.50%          
Line of Credit [Member] | Interest Accrual, Option Three [Member]                    
Debt Instrument [Line Items]                    
Margin on variable rate         1.00%          
Line of Credit [Member] | Minimum [Member] | Interest Accrual, Option One [Member]                    
Debt Instrument [Line Items]                    
Margin on variable rate         1.00%          
Line of Credit [Member] | Minimum [Member] | Interest Accrual, Option Three [Member] | Variable Basis, Additional Margin [Member]                    
Debt Instrument [Line Items]                    
Margin on variable rate         0.00%          
Line of Credit [Member] | Maximum [Member] | Interest Accrual, Option One [Member]                    
Debt Instrument [Line Items]                    
Margin on variable rate         1.75%          
Line of Credit [Member] | Maximum [Member] | Interest Accrual, Option Three [Member] | Variable Basis, Additional Margin [Member]                    
Debt Instrument [Line Items]                    
Margin on variable rate         0.25%          
Senior Notes Due 2021 [Member]                    
Debt Instrument [Line Items]                    
Senior notes         $ 320,600,000   316,500,000      
Term Loan Facility [Member]                    
Debt Instrument [Line Items]                    
Amount outstanding         333,400,000   329,200,000   € 312,000,000  
Credit facility         518,300,000   329,200,000      
Number of loan agreements entered | loan_agreement       7            
Debt instrument, face amount       € 375,000,000 400,700,000.0          
Net proceeds from issuance of long term debt $ 409,500,000     € 373,200,000            
Senior Unsecured Term Loan Due January 15, 2020, 1.056% [Member]                    
Debt Instrument [Line Items]                    
Senior notes         $ 213,700,000   $ 211,000,000 € 200,000,000.0    
Debt instrument, interest rate, percent         1.056%   1.056% 1.056%    
5 7/8% Senior Notes due 2021 [Member]                    
Debt Instrument [Line Items]                    
Senior notes         $ 306,300,000   $ 306,600,000      
Debt instrument, interest rate, percent         5.875%   5.875% 5.875%    
Debt instrument, face amount         $ 306,300,000.0   $ 306,600,000.0      
Debt instrument, redemption price, percentage         100.00%          
5 7/8% Senior Notes due 2021 [Member] | Interest Accrual, Option Two [Member]                    
Debt Instrument [Line Items]                    
Margin on variable rate         0.50%          
Senior Unsecured Term Loan Due April 26, 2021, Total [Member]                    
Debt Instrument [Line Items]                    
Debt instrument, face amount     € 300,000,000   $ 320,600,000          
Senior Unsecured Term Loan Due April 26, 2021, Total [Member] | Minimum [Member]                    
Debt Instrument [Line Items]                    
Margin on variable rate   1.00% 1.00%              
Senior Unsecured Term Loan Due April 26, 2021, Total [Member] | Maximum [Member]                    
Debt Instrument [Line Items]                    
Margin on variable rate   1.75% 1.75%              
Senior Unsecured Term Loan Due April 26, 2021, First Loan [Member]                    
Debt Instrument [Line Items]                    
Debt instrument, face amount | €     € 100,000,000              
Senior Unsecured Term Loan Due April 26, 2021, Second Loan [Member]                    
Debt Instrument [Line Items]                    
Debt instrument, face amount | €     € 200,000,000.0              
Revolving Credit Facility [Member] | Line of Credit [Member]                    
Debt Instrument [Line Items]                    
Maximum borrowing capacity on line of credit facility         800,000,000.0          
Credit facility         $ 184,900,000   0      
Remaining borrowing capacity on line of credit facility             800,000,000      
Rabobank [Member] | Senior Unsecured Term Loan Due April 26, 2021, Total [Member]                    
Debt Instrument [Line Items]                    
Number of loan agreements entered | loan_agreement     2              
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]                    
Debt Instrument [Line Items]                    
Debt instrument, interest rate, percent         0.33%     0.33%    
Fair Value Hedging [Member] | Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]                    
Debt Instrument [Line Items]                    
Deferred gain on hedge termination         $ 6,300,000 $ 7,300,000 $ 7,300,000      
Amortization of deferred hedge gains         $ 300,000