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Debt - Components of Long-term Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Oct. 29, 2020
Dec. 31, 2019
Dec. 31, 2016
Debt Instrument [Line Items]          
Finance leases $ 2.7 $ 5.5      
Other debt 48.6 63.9      
Total 529.4 629.9      
Less – current maturities 18.2 102.8      
Total long-term debt $ 511.2 527.1      
Senior Notes | 6.875% senior secured notes due November 1, 2027          
Debt Instrument [Line Items]          
Stated interest rate (as a percentage) 6.875%        
Face amount $ 485.0 485.0 $ 485.0    
Unamortized discount and fees 6.9 8.1      
Long-term debt, gross 478.1 $ 476.9      
Senior Notes | 5.50% convertible senior notes          
Debt Instrument [Line Items]          
Stated interest rate (as a percentage)   5.50%      
Face amount         $ 213.5
Unamortized discount and fees   $ 0.6      
Long-term debt, gross $ 0.0 $ 83.6   $ 84.2