Segment Reporting - Table 3 (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
General and administrative expenses	$ (53.4)	$ (61.1)
Depreciation and amortization	(52.5)	(45.9)
Net income attributable to noncontrolling interests	22.9	21.4
Income from continuing operations before income tax expense	156.5	135.7
Operating Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total segment Adjusted EBITDA	276.3	257.3
Segment Reconciling Items [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
General and administrative expenses	(53.4)	(61.1)
Depreciation and amortization	(52.5)	(45.9)
Loss on disposal of assets	(1.1)	(0.8)
Interest expense and amortization of debt discounts and fees	(37.2)	(35.6)
Net income attributable to noncontrolling interests	22.9	21.4
SARs mark-to-market impact on noncontrolling interests	0.8	1.0
Change in fair market value of equity securities	0.9	(0.6)
Payroll taxes on SARs exercise	$ (0.2)	$ 0.0

Adjusted earnings before interest, taxes, depreciation, and amortization as defined in the Company's credit agreement.

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