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Long-Term Debt - Summary of Long-Term Debt (Details) - USD ($)
$ in Millions
Jun. 30, 2021
May 03, 2021
Dec. 31, 2020
Debt Instrument [Line Items]      
Finance lease obligations $ 281.7   $ 281.2
Less: unamortized debt issuance costs and discounts (16.8)   (16.3)
Total debt 2,855.7   2,856.8
Less: Current maturities 69.6   64.4
Total long-term debt 2,786.1   2,792.4
Secured Debt | Senior secured term loan      
Debt Instrument [Line Items]      
Long-term debt 1,538.2   1,539.4
Unamortized fair value discount (premium) (3.2)   3.7
Senior Notes | 6.750% senior unsecured notes due 2025      
Debt Instrument [Line Items]      
Long-term debt $ 370.0   370.0
Stated interest rate (percent) 6.75% 6.75%  
Senior Notes | 10.000% senior unsecured notes due 2027      
Debt Instrument [Line Items]      
Long-term debt $ 545.0   545.0
Stated interest rate (percent) 10.00%    
Notes payable and other secured loans      
Debt Instrument [Line Items]      
Long-term debt $ 137.6   $ 137.5