Income Taxes - Income taxes relating to continuing operations and deferred taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income from continuing operations before income taxes by geographic region
U.S.	$ 1,242.6	$ 512.4	$ 427.8
Non-U.S.	365.1	195.2	163.7
Income from continuing operations before income taxes	1,607.7	707.6	591.5
Current:
Federal	115.7	(78.1)	23.6
State and local	48.1	7.3	4.3
Non-U.S.	67.7	39.2	36.8
Total current	231.5	(31.6)	64.7
Deferred:
Federal	129.9	165.4	67.6
State and local	33.9	22.5	24.0
Non-U.S.	21.0	6.4	0.4
Total deferred	184.8	194.3	92.0
Income taxes	416.3	162.7	156.7
Reconciliation of income taxes from continuing operations at federal statutory rate
Income taxes at federal statutory rate	337.6	148.6	124.2
State and local income taxes, net of federal taxes	64.6	21.9	23.6
Non-U.S. income taxed at other rates	11.9	4.6	2.8
Rate differential from NOL carryback	0.0	(21.6)	0.0
Foreign tax credit revaluation	0.0	12.3	0.0
Other	2.2	(3.1)	6.1
Income taxes	416.3	162.7	$ 156.7
Deferred Tax Assets
Accrued liabilities	68.7	64.6
Net operating loss and credit carryforwards	60.7	102.6
Leasing liabilities	605.4	596.9
Other	31.0	31.5
Total deferred tax assets	765.8	795.6
Valuation allowance	(67.0)	(64.2)
Net deferred tax assets	698.8	731.4
Deferred Tax Liabilities
Depreciation and amortization	(283.8)	(242.9)
Partnership investments	(861.4)	(757.4)
Leasing assets	(605.4)	(596.9)
Other	(8.6)	(7.3)
Total deferred tax liabilities	(1,759.2)	(1,604.5)
Net deferred tax liabilities	(1,060.4)	$ (873.1)
Amount of total temporary difference related to the excess of financial reporting basis over tax basis in the non-U.S. subsidiaries on which U.S. federal income taxes are not provided	$ 442.8