Debt - Schedule of Components of Long-term Debt (Details) - USD ($)	Sep. 30, 2020	Apr. 15, 2020	Dec. 31, 2019	Aug. 06, 2019	Dec. 31, 2016
Debt Instrument [Line Items]
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:LongTermDebtAndCapitalLeaseObligationsCurrent		us-gaap:LongTermDebtAndCapitalLeaseObligationsCurrent
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	us-gaap:LongTermDebtAndCapitalLeaseObligations		us-gaap:LongTermDebtAndCapitalLeaseObligations
Finance leases	$ 6,000,000.0		$ 5,300,000
Other debt	59,700,000		59,600,000
Total	148,400,000		579,400,000
Less – current maturities	100,000,000.0		13,500,000
Total long-term debt	48,400,000		$ 565,900,000
5.50% convertible senior notes due March 1, 2021
Debt Instrument [Line Items]
Face value					$ 1,000
Senior Notes | 10.75% senior notes
Debt Instrument [Line Items]
Interest rate		10.75%	10.75%
Face value			$ 440,000,000.0
Unamortized discount and fees			5,500,000
Senior notes	$ 0		434,500,000
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		84,200,000		$ 213,500,000
Unamortized discount and fees	1,500,000		4,200,000
Senior notes	$ 82,700,000		$ 80,000,000.0	$ 84,200,000