Leases - Schedule of Components of Lease Cost (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Lessor, Lease, Description [Line Items]
Operating lease cost	$ 17.0	$ 6.3	$ 44.3	$ 67.1
Short-term lease	4.3	4.7	13.2	18.9
Variable lease	11.2	5.0	23.2	14.7
Operating lease cost	32.5	16.0	80.7	100.7
Amortization of leased assets	1.3	1.3	4.3	2.8
Interest on lease liabilities	0.2	0.3	0.8	0.8
Lease impairment	3.5	0.3	3.6	94.5
Net lease cost	$ 37.5	19.2	$ 89.4	200.1
General And Administrative Expense
Lessor, Lease, Description [Line Items]
Lease impairment		$ 1.3		$ 1.3