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Indebtedness (Narrative) (Details)
1 Months Ended 3 Months Ended 12 Months Ended
Aug. 01, 2018
USD ($)
May 09, 2018
Oct. 31, 2018
USD ($)
Oct. 31, 2016
EUR (€)
loan_agreement
Jun. 30, 2017
USD ($)
Dec. 31, 2018
USD ($)
loan_agreement
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2018
EUR (€)
loan_agreement
Oct. 31, 2018
EUR (€)
Sep. 30, 2018
USD ($)
Aug. 30, 2018
loan_agreement
Dec. 31, 2017
EUR (€)
Apr. 30, 2016
EUR (€)
loan_agreement
Debt Instrument [Line Items]                            
Debt Repurchase, Convertible, Conversion Ratio   1.0775                        
Interest Paid, Including Capitalized Interest, Operating and Investing Activities           $ 35,200,000 $ 55,200,000 $ 58,800,000            
Number of Term Loan Agreements | loan_agreement       7   14     14     7   2
Line of credit | €                 € 97,000,000       € 471,200,000  
Interest Notes Payable           1.002%     1.002%          
Amortization of deferred hedge gains           $ 4,700,000                
Outstanding letters of credit           14,100,000 15,200,000              
Net Investment Hedging | Designated as Hedging Instrument                            
Debt Instrument [Line Items]                            
Notional amount of foreign currency derivatives | €                 € 312,000,000          
Cash Flow Hedging | Designated as Hedging Instrument                            
Debt Instrument [Line Items]                            
Notional amount of foreign currency derivatives           $ 1,462,800,000                
Cash Flow Hedging | Interest Rate Swap | Designated as Hedging Instrument                            
Debt Instrument [Line Items]                            
Notional amount of foreign currency derivatives | €                 € 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           1,300,000 5,300,000              
Senior term loans due between 2019 and 2026                            
Debt Instrument [Line Items]                            
Debt, face amount | €       € 375,000,000                    
Senior Notes           815,300,000 449,700,000              
1.056% Senior term loan due 2020(1)                            
Debt Instrument [Line Items]                            
Senior Notes           $ 228,700,000 $ 239,800,000   € 200,000,000.0          
Debt Interest Rate           1.056% 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% 0.70%   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     0.875% 2.26%   0.25%                
Line of Credit | Revolving Credit Facility                            
Debt Instrument [Line Items]                            
Maximum borrowing capacity           $ 800,000,000                
Remaining borrowing capacity           685,600,000                
Credit facility, expires 2023(1)                            
Debt Instrument [Line Items]                            
Senior Notes           $ 114,400,000 $ 471,200,000              
Line of credit | €                 € 312,000,000          
Proceeds from issuance of debt $ 338,000,000                          
4½% Senior term loan due 2016                            
Debt Instrument [Line Items]                            
Debt Interest Rate           4.50% 4.50%   4.50%       4.50%  
5 7/8% Senior notes due 2021                            
Debt Instrument [Line Items]                            
Debt, face amount     $ 122,500,000             € 114,100,000        
Senior Notes           $ 0 $ 305,300,000              
Debt Interest Rate           5.875% 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                     $ 113,200,000     € 100,000,000
Senior Unsecured Term Loan Due April 26, 2021, Second Loan                            
Debt Instrument [Line Items]                            
Debt, face amount                     $ 239,800,000      
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%                
United States of America, Dollars                            
Debt Instrument [Line Items]                            
Long-term line of credit           $ 284,600,000                
United States of America, Dollars | Credit facility, expires 2023(1)                            
Debt Instrument [Line Items]                            
Line of credit | €                         € 374,200,000  
United States of America, Dollars | Credit facility, expires 2023(1) | Cash Flow Hedging | Interest Rate Swap | Designated as Hedging Instrument                            
Debt Instrument [Line Items]                            
Line of credit | €                 € 360,800,000