Leases - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Lessor, Lease, Description [Line Items]
Right-of-use assets	$ 191.9		$ 191.9		$ 235.1
Lease impairment	3.5	$ 0.3	3.6	$ 94.5
Rent concessions cares act	3.1	9.2	14.2	18.1
Sublease income	0.4	0.4	1.1	1.2
Lease Impairment
Lessor, Lease, Description [Line Items]
Lease impairment	3.5	0.3	3.6	94.5
General And Administrative Expense
Lessor, Lease, Description [Line Items]
Lease impairment		1.3		1.3
Commercial
Lessor, Lease, Description [Line Items]
Lease impairment			3.5	95.8
Aviation
Lessor, Lease, Description [Line Items]
Lease impairment			0.1
Level 3
Lessor, Lease, Description [Line Items]
Right-of-use assets	5.6	271.0	5.6	271.0
Right-of-use asset, fair value	$ 2.0	$ 175.2	$ 2.0	$ 175.2