Income Taxes, Deferred Tax Assets and Deferred Tax Liabilities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Deferred tax assets attributable to:
Accrued expenses	$ 224.2	$ 170.5	$ 153.0
U.S. federal and state loss and credit carryovers	21.7	6.6	14.6
Allowances for uncollectible accounts	12.7	7.1	6.8
International loss carryovers	118.1	121.0	136.9
Investments in real estate ventures	0.0	26.9	33.6
Pension liabilities	18.2	12.6	20.0
Other	7.4	0.0	0.0
Deferred tax assets, gross	402.3	344.7	364.9
Less: valuation allowances	(51.7)	(51.7)	(62.0)
Deferred tax assets, net	350.6	293.0	302.9
Deferred tax liabilities attributable to:
Property and equipment	24.3	0.6	1.6
Intangible assets	152.8	123.9	101.7
Income deferred for tax purposes	2.1	2.2	1.6
Deferred Tax Liabilities, Investment in Noncontrolled Affiliates	11.9	0.0	0.0
Other	0.1	0.4	5.5
Deferred tax liabilities	191.2	127.1	110.4
Net deferred taxes	159.4	$ 165.9	$ 192.5
Operating Loss Carryforwards [Line Items]
Estimate of US and state tax liability in the event of repatriation of foreign earnings	204.0
U.S. [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	$ 27.1
Operating loss carryforwards, expiration dates	Jan. 01, 2036
State [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	$ 12.3
Operating loss carryforwards, expiration dates	Jan. 01, 2036
International [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	$ 535.7