Leases - Schedule of Lease Costs and Other Information Related to Operating and Finance Leases (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Feb. 22, 2021
Leases [Abstract]
Short-term lease costs	$ 1.9	$ 5.4
Operating lease cost	2.6	3.0
Operating cash outflows from operating leases	$ 2.6	$ 2.9
Weighted average remaining lease term	6 years 1 month 6 days	5 years 9 months 18 days
Weighted average discount rate	8.50%	9.30%
Amortization of finance leases	$ 4.7	$ 5.2
Interest on lease liabilities	0.4	0.8
Financing cash outflows from finance leases	$ 4.7	$ 4.8
Weighted average remaining lease term	1 year 2 months 12 days	1 year 4 months 24 days
Weighted average discount rate	3.90%	4.30%
Subsequent Event
Lessee, Lease, Description [Line Items]
Cash consideration			$ 3.5