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Indebtedness (Narrative) (Details)
3 Months Ended 9 Months Ended
Oct. 19, 2016
USD ($)
loan_agreement
Oct. 19, 2016
EUR (€)
Apr. 26, 2016
USD ($)
loan_agreement
Apr. 26, 2016
EUR (€)
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Sep. 30, 2016
USD ($)
Oct. 19, 2016
EUR (€)
loan_agreement
Sep. 30, 2016
EUR (€)
Apr. 26, 2016
EUR (€)
loan_agreement
Dec. 31, 2015
USD ($)
Dec. 31, 2015
EUR (€)
Sep. 30, 2015
USD ($)
Dec. 31, 2014
EUR (€)
Debt Instrument [Line Items]                            
Debt instrument, unused borrowing capacity | €                           € 200,000,000.0
Credit facility         $ 953,800,000   $ 953,800,000       $ 338,900,000      
Remaining borrowing capacity on line of credit facility         196,900,000   196,900,000              
Long-term debt, fair value                     297,400,000      
Amortization of Deferred Hedge Gains         100,000                  
Outstanding letters of credit         17,300,000   17,300,000       17,500,000      
4 1/2% Senior Unsecured Term Loan Due 2016 [Member]                            
Debt Instrument [Line Items]                            
Senior notes         $ 0   $ 0       $ 217,200,000      
Debt instrument, interest rate, percent         4.50%   4.50%   4.50%   4.50% 4.50%    
Debt instrument, face amount     $ 225,400,000             € 200,000,000.0        
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%              
Term Loan Facility [Member]                            
Debt Instrument [Line Items]                            
Amount outstanding         $ 350,700,000   $ 350,700,000   € 312,000,000   $ 338,900,000 € 312,000,000    
Senior Unsecured Term Loan Due January 15, 2020, 1.056% [Member]                            
Debt Instrument [Line Items]                            
Senior notes         $ 224,800,000   $ 224,800,000   € 200,000,000.0   $ 217,200,000      
Debt instrument, interest rate, percent         1.056%   1.056%   1.056%   1.056% 1.056%    
5 7/8% Senior Notes due 2021 [Member]                            
Debt Instrument [Line Items]                            
Senior notes         $ 306,900,000   $ 306,900,000       $ 297,400,000      
Debt instrument, interest rate, percent         5.875%   5.875%   5.875%   5.875% 5.875%    
Long-term debt, fair value         $ 306,900,000   $ 306,900,000              
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     $ 337,200,000             300,000,000        
Senior Unsecured Term Loan Due April 26, 2021, Total [Member] | Minimum [Member]                            
Debt Instrument [Line Items]                            
Margin on variable rate             1.00%              
Senior Unsecured Term Loan Due April 26, 2021, Total [Member] | Maximum [Member]                            
Debt Instrument [Line Items]                            
Margin on variable rate             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   $ 800,000,000.0              
Credit facility         603,100,000   603,100,000       $ 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             2        
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member]                            
Debt Instrument [Line Items]                            
Derivative, notional amount         $ 56,200,000   $ 56,200,000       $ 0      
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%   0.33%          
Derivative, notional amount         $ 350,700,000   $ 350,700,000   € 312,000,000          
Net Investment Hedging [Member] | Designated as Hedging Instrument [Member]                            
Debt Instrument [Line Items]                            
Derivative, notional amount         350,700,000   350,700,000   € 312,000,000          
Fair Value Hedging [Member] | Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]                            
Debt Instrument [Line Items]                            
Derivative, notional amount                         $ 300,000,000  
Deferred gain on hedge termination           $ 7,300,000                
Unamortized deferred gain on hedge termination         6,900,000   6,900,000              
Amortization of Deferred Hedge Gains         $ 400,000   $ 400,000              
Subsequent Event [Member] | Term Loan Facility [Member]                            
Debt Instrument [Line Items]                            
Number of loan agreements entered | loan_agreement 7             7            
Debt instrument, face amount $ 411,500,000.0             € 375,000,000            
Net proceeds from issuance of long term debt $ 409,500,000 € 373,200,000