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Long-Term Debt and Finance Leases - Term B Loans and Revolving Credit Facility (Details) - USD ($)
$ in Millions
Jul. 17, 2017
Mar. 31, 2020
Dec. 31, 2019
Long-Term Debt and Capital Leases      
Long-term debt   $ 2,301.2 $ 2,275.3
Term B Loans      
Long-Term Debt and Capital Leases      
Long-term debt   2,215.2 2,220.3
Term B Loans | Alternate base rate      
Long-Term Debt and Capital Leases      
Basis spread on variable rate (as a percent) 2.25%    
Term B Loans | Adjusted LIBOR rate      
Long-Term Debt and Capital Leases      
Basis spread on variable rate (as a percent) 3.25%    
Revolving Credit Facility      
Long-Term Debt and Capital Leases      
Long-term debt   86.0 $ 55.0
Borrowings available   $ 300.0  
Revolving Credit Facility | Alternate base rate      
Long-Term Debt and Capital Leases      
Basis spread on variable rate (as a percent) 2.00%    
Revolving Credit Facility | Adjusted LIBOR rate      
Long-Term Debt and Capital Leases      
Basis spread on variable rate (as a percent) 3.00%