Segment Reporting - Table 3 (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
General and administrative expenses	$ (39.7)		$ (30.3)	$ (128.6)	$ (96.6)
Depreciation and amortization	(46.2)		(43.5)	(137.2)	(128.8)
Professional fees—accounting, tax, and legal	0.0		0.0	0.0	(1.9)
Loss on early extinguishment of debt	(0.3)	$ (10.4)	(2.6)	(10.7)	(7.4)
Net income attributable to noncontrolling interests	19.2		16.4	53.2	53.7
Income from continuing operations before income tax expense	128.3		120.3	360.5	360.5
Operating Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total segment Adjusted EBITDA	235.1		224.4	705.6	674.0
Segment Reconciling Items [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
General and administrative expenses	39.7		30.3	128.6	96.6
Depreciation and amortization	46.2		43.5	137.2	128.8
Loss on disposal of assets	(3.0)		(1.6)	(3.3)	(2.0)
Professional fees—accounting, tax, and legal	0.0		0.0	0.0	1.9
Loss on early extinguishment of debt	(0.3)		(2.6)	(10.7)	(7.4)
Interest expense and amortization of debt discounts and fees	36.8		42.5	118.5	130.5
Net income attributable to noncontrolling interests	$ 19.2		$ 16.4	$ 53.2	$ 53.7