Leases - Supplemental Income Statement Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating lease cost:
Operating leases	$ 19.8	$ 28.8	$ 43.3
Short-term leases	15.5	39.1	49.7
Variable leases	2.7	4.6	19.1
Sublease income	(1.9)	(2.3)	(2.6)
Total operating lease cost	36.1	70.2	109.5
Finance leases:
Amortization of right-of-use assets	5.9	3.5	15.3
Interest on lease liabilities	2.7	0.8	1.5
Total finance lease cost	$ 8.6	$ 4.3	$ 16.8