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Indebtedness (Debt Terms) (Details)
$ in Millions
1 Months Ended 12 Months Ended
Aug. 01, 2018
EUR (€)
Oct. 31, 2018
USD ($)
Oct. 31, 2016
EUR (€)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2019
EUR (€)
Dec. 31, 2018
EUR (€)
May 31, 2018
USD ($)
Apr. 30, 2016
EUR (€)
Debt Instrument [Line Items]                    
Debt instrument, Repurchase Amount, Principal Amount                 $ 185.9  
Write off of Deferred Debt Issuance Cost         $ 0.9          
Line of Credit Facility, Fair Value of Amount Outstanding         114.4          
Debt Instrument, Purchase Price of Repurchased Debt                 $ 200.3  
Gain (Loss) on Extinguishment of Debt       $ 0.0 $ (24.5) $ 0.0        
Senior Notes Due December 1, 2021, 5.875% [Member]                    
Debt Instrument [Line Items]                    
Debt instrument, Repurchase Amount, Principal Amount   $ 114.1                
Debt Interest Rate       5.875% 5.875%   5.875% 5.875%    
Debt Instrument, Purchase Price of Repurchased Debt   122.5                
Senior Unsecured Term Loan Due April 26, 2021, Second Loan [Member]                    
Debt Instrument [Line Items]                    
Debt, face amount           $ 239.8        
Senior term loans due between 2019 and 2026                    
Debt Instrument [Line Items]                    
Debt, face amount | €     € 375,000,000.0              
Senior Notes       $ 736.2 $ 815.3          
Credit facility, expires 2023(1)                    
Debt Instrument [Line Items]                    
Proceeds from Issuance of Debt | € € 338,000,000.0                  
Senior Notes       0.0 $ 114.4          
Line of Credit Facility, Fair Value of Amount Outstanding | €               € 312,000,000.0    
Credit facility, expires 2023(1) | Term Loans Due 2019 and 2028 [Member]                    
Debt Instrument [Line Items]                    
Senior Notes       $ 736.2     € 657,000,000.0      
Senior Unsecured Term Loan Due April 26, 2021, First Loan [Member]                    
Debt Instrument [Line Items]                    
Debt, face amount   $ 113.2               € 100,000,000.0
Interest Accrual, Option Three [Member] | Line of Credit [Member]                    
Debt Instrument [Line Items]                    
Debt Instrument, Basis Spread on Variable Rate   1.00%                
Variable Basis, Additional Margin [Member] | Minimum | Interest Accrual, Option Three [Member] | Line of Credit [Member]                    
Debt Instrument [Line Items]                    
Debt Instrument, Basis Spread on Variable Rate   0.00% 0.70% 0.00%            
Variable Basis, Additional Margin [Member] | Maximum | Interest Accrual, Option Three [Member] | Line of Credit [Member]                    
Debt Instrument [Line Items]                    
Debt Instrument, Basis Spread on Variable Rate   0.875% 2.26% 0.25%            
Euro Member Countries, Euro                    
Debt Instrument [Line Items]                    
Long-term Line of Credit | €             € 250,000,000.0 € 250,000,000.0    
United States of America, Dollars                    
Debt Instrument [Line Items]                    
Long-term Line of Credit       $ 280.2            
London Interbank Offered Rate (LIBOR) [Member] | Variable Basis, Additional Margin [Member] | Minimum | Interest Accrual, Option Three [Member] | Line of Credit [Member]                    
Debt Instrument [Line Items]                    
Debt Instrument, Basis Spread on Variable Rate   0.875%                
London Interbank Offered Rate (LIBOR) [Member] | Variable Basis, Additional Margin [Member] | Maximum | Interest Accrual, Option Three [Member] | Line of Credit [Member]                    
Debt Instrument [Line Items]                    
Debt Instrument, Basis Spread on Variable Rate   1.875%                
EURIBOR [Member] | Variable Basis, Additional Margin [Member] | Minimum | Interest Accrual, Option Three [Member] | Line of Credit [Member]                    
Debt Instrument [Line Items]                    
Debt Instrument, Basis Spread on Variable Rate     0.70%              
EURIBOR [Member] | Variable Basis, Additional Margin [Member] | Maximum | Interest Accrual, Option Three [Member] | Line of Credit [Member]                    
Debt Instrument [Line Items]                    
Debt Instrument, Basis Spread on Variable Rate     1.25%