Debt - Schedule of Components of Long-term Debt (Details) - USD ($)	Mar. 31, 2021	Dec. 31, 2020	Oct. 29, 2020	Dec. 31, 2019	Dec. 31, 2016
Debt Instrument [Line Items]
Finance leases	$ 4,700,000	$ 5,500,000
Other debt	59,200,000	63,900,000
Total	541,100,000	629,900,000
Less – current maturities	19,900,000	102,800,000
Total long-term debt	$ 521,200,000	527,100,000
Senior Notes | 6.875% senior secured notes due November 1, 2027
Debt Instrument [Line Items]
Interest rate	6.875%		6.875%
Face value	$ 485,000,000.0	485,000,000.0	$ 485,000,000.0
Unamortized discount and fees	7,800,000	8,100,000
Senior notes	$ 477,200,000	$ 476,900,000
Senior Notes | 5.50% convertible senior notes due March 1, 2021
Debt Instrument [Line Items]
Interest rate	5.50%	5.50%
Face value		$ 84,200,000			$ 213,500,000
Unamortized discount and fees		600,000
Senior notes	$ 0	$ 83,600,000		$ 84,200,000