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Debt (Textuals) (Details)
€ in Millions, $ in Millions
1 Months Ended 3 Months Ended
May 02, 2016
USD ($)
Mar. 31, 2016
USD ($)
Mar. 31, 2017
USD ($)
Mar. 31, 2016
USD ($)
Mar. 31, 2013
USD ($)
Jun. 30, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Apr. 30, 2016
EUR (€)
Apr. 30, 2016
USD ($)
Mar. 31, 2006
USD ($)
Debt (Textuals)                        
Debt issuance costs     $ 0.0 $ 0.8                
Debt Instrument, Covenant Compliance     As of March 31 2017, the Company was in compliance with the financial covenants in its debt agreements.                  
Repayments of Other Debt     $ 84.0 $ 198.0                
Minimum [Member]                        
Debt (Textuals)                        
Adjusted EBITDA To Net Interest Expense Coverage Ratio     3.00                  
Maximum [Member]                        
Debt (Textuals)                        
Net Debt To EBITDA Leverage Ratio     4.50                  
Maximum [Member] | Subsequent Event [Member]                        
Debt (Textuals)                        
Net Debt To EBITDA Leverage Ratio           3.75 4.00 4.25        
Revolving Credit Facility [Member]                        
Debt (Textuals)                        
Amount available     $ 520.0                  
Weighted average interest rate on credit facility borrowings outstanding     2.75%           2.56%      
Description of interest rate terms     LIBOR + 1.75%                  
June 2015 Revolving Credit Facility [Member]                        
Debt (Textuals)                        
Current borrowing capacity     $ 520.0                  
June 2015 Term Loan [Member] | Initial Borrowing Capacity [Member]                        
Debt (Textuals)                        
Unsecured Debt     230.0                  
December 2015 Revolving Credit Facility [Member]                        
Debt (Textuals)                        
Current borrowing capacity     $ 520.0                  
December 2015 Term Loan [Member]                        
Debt (Textuals)                        
Description of interest rate terms     LIBOR + 1.75%                  
December 2015 Term Loan [Member] | Initial Borrowing Capacity [Member]                        
Debt (Textuals)                        
Unsecured Debt     $ 230.0                  
Delayed Draw Term Loan A [Member]                        
Debt (Textuals)                        
Description of interest rate terms     LIBOR + 1.75%                  
Delayed Draw Term Loan A [Member] | Initial Borrowing Capacity [Member]                        
Debt (Textuals)                        
Unsecured Debt     $ 250.0                  
2024 Senior Notes [Member]                        
Debt (Textuals)                        
Description of interest rate terms     0.085                  
Term Loan B USD [Member]                        
Debt (Textuals)                        
Description of interest rate terms [1]     LIBOR(i) + 4.50%                  
Unsecured Debt                     $ 1,000.0  
Term Loan B USD [Member] | Minimum [Member]                        
Debt (Textuals)                        
Description of interest rate terms     LIBOR with a floor of 0.75%                  
Term Loan B EUR [Member]                        
Debt (Textuals)                        
Description of interest rate terms [2]     EURIBOR(ii) + 4.25%                  
Unsecured Debt | €                   € 350.0    
Term Loan B EUR [Member] | Minimum [Member]                        
Debt (Textuals)                        
Description of interest rate terms     EURIBOR with a floor of 0.75%                  
Term Loan B [Member]                        
Debt (Textuals)                        
Expected Percent Funded Of Par     99.00%                  
2006 Senior Notes [Member]                        
Debt (Textuals)                        
Issuance of Senior Notes, Principal amount                       $ 300.0
Repayments of Long-term Debt $ 50.0 $ 175.0     $ 75.0              
Long Term Debt Make Whole Premium $ 3.9                      
International Short-Term Uncommitted Line of Credit [Member]                        
Debt (Textuals)                        
Borrowing limit of short term uncommitted line of credit     $ 226.5                  
Weighted average interest rate on outstanding borrowings     5.83%           9.87%      
Amount available     $ 183.6                  
Maturity time of short term uncommitted lines     less than one year                  
[1] LIBOR with a floor of 0.75%
[2] EURIBOR with a floor of 0.75%