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Debt (Textuals) (Details)
$ in Millions
2 Months Ended 3 Months Ended 9 Months Ended 13 Months Ended
Jun. 30, 2017
Sep. 30, 2017
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
May 08, 2017
Jun. 30, 2019
Dec. 31, 2018
Dec. 31, 2017
May 09, 2017
USD ($)
Dec. 31, 2016
Apr. 30, 2016
USD ($)
Apr. 19, 2016
USD ($)
Debt (Textuals)                        
Description of interest rate terms         LIBOR plus an applicable margin of 4.50 percent (or, at the Company’s option, prime plus an applicable margin of 3.50 percent)              
Debt issuance costs     $ 1.1 $ 39.2                
Debt Instrument, Covenant Compliance     As of March 31 2017, the Company was in compliance with the financial covenants in its debt agreements.                  
Interest Expense   $ 5.0 $ 5.0                  
Repricing Premium Percentage   1.00% 1.00%                  
Total Net Leverage Ratio   2.5 2.5                  
Repayments of Other Debt     $ 433.5 $ 419.2                
Minimum [Member]                        
Debt (Textuals)                        
Adjusted EBITDA To Net Interest Expense Coverage Ratio   3.00 3.00                  
Maximum [Member]                        
Debt (Textuals)                        
Net Debt To EBITDA Leverage Ratio   4.50 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   $ 167.2 $ 167.2                  
Weighted average interest rate on credit facility borrowings outstanding   3.25% 3.25%             2.56%    
Description of interest rate terms   LIBOR + 2.00%                    
June 2015 Revolving Credit Facility [Member]                        
Debt (Textuals)                        
Current borrowing capacity   $ 520.0 $ 520.0                  
June 2015 Term Loan [Member] | Initial Borrowing Capacity [Member]                        
Debt (Textuals)                        
Unsecured Debt   230.0 230.0                  
December 2015 Revolving Credit Facility [Member]                        
Debt (Textuals)                        
Current borrowing capacity   $ 520.0 520.0                  
December 2015 Term Loan [Member]                        
Debt (Textuals)                        
Description of interest rate terms   LIBOR + 2.00%                    
December 2015 Term Loan [Member] | Initial Borrowing Capacity [Member]                        
Debt (Textuals)                        
Unsecured Debt   $ 230.0 230.0                  
Senior Notes Due 2024 [Member]                        
Debt (Textuals)                        
Unsecured Debt                       $ 400.0
Delayed Draw Term Loan A [Member]                        
Debt (Textuals)                        
Description of interest rate terms   LIBOR + 2.00%                    
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 plus 2.75 percent (with a floor of 0.00 percent) or Alternate Base Rate (ABR) plus 1.75 percent (with an ABR floor of 1.00 percent) LIBOR(i) + 2.75%                    
Unsecured Debt                 $ 475.0   $ 1,000.0  
Term Loan B USD [Member] | Minimum [Member]                        
Debt (Textuals)                        
Description of interest rate terms   LIBOR with a floor of 0.0%                    
Delayed Draw Term Loan A Facility [Member]                        
Debt (Textuals)                        
Unsecured Debt                 250.0      
Term Loan B EUR [Member]                        
Debt (Textuals)                        
Description of interest rate terms [2]   EURIBOR(ii) + 3.00%     EURIBOR plus an applicable margin of 4.25 percent              
Unsecured Debt                 $ 70.0      
Term Loan B EUR [Member] | Minimum [Member]                        
Debt (Textuals)                        
Description of interest rate terms   EURIBOR with a floor of 0.0%                    
International Short-Term Uncommitted Line of Credit [Member]                        
Debt (Textuals)                        
Borrowing limit of short term uncommitted line of credit   $ 191.4 $ 191.4                  
Weighted average interest rate on outstanding borrowings   9.10% 9.10%             9.87%    
Amount available   $ 400.0 $ 400.0                  
Maturity time of short term uncommitted lines     less than one year                  
[1] LIBOR with a floor of 0.0%
[2] EURIBOR with a floor of 0.0%