Income Taxes - Income taxes relating to continuing operations and deferred taxes (Details) - USD ($) $ in Millions		12 Months Ended
	Dec. 22, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income from continuing operations before income taxes by geographic region
U.S.		$ 427.8	$ 390.3	$ 375.4
Non-U.S.		163.7	213.8	172.8
Income from continuing operations before income taxes		591.5	604.1	548.2
Current:
Federal		23.6	(15.6)	(3.5)
State and local		4.3	(2.9)	4.2
Foreign		36.8	46.9	43.2
Total current		64.7	28.4	43.9
Deferred:
Federal		67.6	85.9	(150.5)
State and local		24.0	20.0	47.2
Foreign		0.4		(5.4)
Total deferred		92.0	105.9	(108.7)
Income taxes		156.7	$ 134.3	(64.8)
Reconciliation of income taxes from continuing operations at federal statutory rate
Federal statutory income tax rate (as a percent)	35.00%		21.00%
Income taxes at federal statutory rate of 35%		124.2	$ 126.9	191.9
State and local income taxes, net of federal taxes		23.6	13.8	13.7
Non-U.S. income taxed at other rates		2.8	1.9	(25.2)
Revaluation of U.S. deferreds				(301.6)
Deemed mandatory repatriation				54.8
SAB 118 Benefit			(11.6)
Other		6.1	3.3	1.6
Income taxes		156.7	134.3	(64.8)
Deferred Tax Assets
Accrued liabilities		49.7	48.7
Net operating loss and credit carryforwards		72.8	81.4
Leasing liabilities		577.8
Other		27.6	27.9
Total deferred tax assets		727.9	158.0
Valuation allowance		(45.7)	(40.5)
Net deferred tax assets		682.2	117.5
Deferred Tax Liabilities
Depreciation and amortization		(206.9)	(188.0)
Partnership investments		(569.0)	(499.3)
Leasing assets		(577.8)
Other		(6.4)	(8.0)
Total deferred tax liabilities		(1,360.1)	(695.3)
Net deferred tax liabilities		(677.9)	(577.8)
Income from continuing operations before income taxes of non-U.S. subsidiaries		163.7	$ 213.8	$ 172.8
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		$ 109.5