Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Current:
Federal	$ 61.8	$ 51.2	$ 6.5
State and local	11.5	7.9	5.0
Foreign	40.1	43.5	34.2
Total current	113.4	102.6	45.7
Deferred:
Federal	40.1	42.9	71.3
State and local	8.4	9.3	9.5
Foreign	(3.9)	(1.7)	(3.2)
Total deferred	44.6	50.5	77.6
Income taxes relating to continuing operations	$ 158.0	$ 153.1	$ 123.3
Reconciliation of income taxes from continuing operations at federal statutory rate
Federal statutory income tax rate (as a percent)	35.00%	35.00%	35.00%
Income taxes relating to continuing operations at federal statutory rate of 35%	$ 172.2	$ 160.3	$ 130.1
State and local income taxes, net of federal taxes	13.3	11.0	8.7
Non-U.S. income taxed at other rates	(27.4)	(17.7)	(15.8)
Other	(0.1)	(0.5)	0.3
Income taxes relating to continuing operations	158.0	153.1	123.3
Deferred Tax Assets
Accrued liabilities	67.5	72.1
Net operating loss carryforwards	17.9	16.0
Other	26.2	8.4
Total deferred tax assets	111.6	96.5
Valuation allowance	(17.3)	(18.2)
Net deferred tax assets	94.3	78.3
Deferred Tax Liabilities
Depreciation and amortization	(198.1)	(187.6)
Partnership investments	(285.5)	(253.0)
Convertible notes	(7.5)	(10.0)
Other	(6.1)	(3.5)
Total deferred tax liabilities	(497.2)	(454.1)
Net deferred tax liabilities	(402.9)	(375.8)
Income from continuing operations before income taxes of non-U.S. subsidiaries	182.5	$ 170.6	$ 134.7
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	$ 790.0