Leases - Schedule of Lease Cost (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Short-term lease cost	$ 6.5	$ 14.3
Operating lease cost	6.6	6.7
Finance lease interest expense	0.1	0.0
Finance lease amortization expense	0.2	0.0
Total lease cost	13.4	21.0
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases	6.0	5.2
Operating cash flows from finance leases	0.1	0.0
Financing cash flows from finance lease	0.1	0.0
ROUAs obtained in exchange for lease obligations
Operating leases	2.8	3.7
Finance leases	$ 5.1	$ 1.5
Weighted Average Remaining Lease Term
Operating leases	5 years 10 months 24 days	6 years 6 months
Finance leases	18 years 4 months 24 days	14 years 10 months 24 days
Weighted Average Discount Rate
Operating leases	3.80%	3.90%
Finance leases	2.90%	3.90%