Segment Reporting Segment Reporting - Table 3 (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2016	Mar. 31, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
General and administrative expenses	$ (34.4)		$ (32.1)	$ (66.3)	$ (66.7)
Depreciation and amortization	(42.9)		(32.7)	(85.3)	(64.6)
(Loss) gain on disposal or impairment of assets	(0.2)		(0.8)	(0.4)	0.7
Government, class action, and related settlements	0.0		0.0	0.0	(8.0)
Professional fees - accounting, tax, and legal	(1.7)		(0.1)	(1.9)	(2.3)
Loss on early extinguishment of debt	(2.4)	$ (2.4)	(18.8)	(4.8)	(20.0)
Interest expense and amortization of debt discounts and fees	(43.4)		(30.9)	(88.0)	(62.7)
Net income attributable to noncontrolling interests	18.6		17.3	37.3	33.8
Gain related to SCA equity interest	0.0		2.6	0.0	2.6
Income from continuing operations before income tax expense	123.7		94.0	240.2	183.6
Inpatient Rehabilitation Hospital and Home Health and Hospice [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total segment Adjusted EBITDA	$ 230.1		$ 189.5	$ 449.6	$ 370.8