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Segment Reporting Segment Reporting - Reconciliation of Adjusted EBITDA (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
General and administrative expenses									$ (171.7)	$ (133.4)	$ (133.3)
Depreciation and amortization									(183.8)	(172.6)	(139.7)
Government, class action, and related settlements									0.0	0.0	(7.5)
Professional fees—accounting, tax, and legal									0.0	(1.9)	(3.0)
Loss on early extinguishment of debt									(10.7)	(7.4)	(22.4)
Net income attributable to noncontrolling interests	$ 25.9	$ 19.2	$ 16.4	$ 17.6	$ 16.8	$ 16.4	$ 18.6	$ 18.7	79.1	70.5	69.7
Income from continuing operations before income tax expense									496.4	482.0	395.6
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									947.1	899.6	774.1
Segment Reconciling Items [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
General and administrative expenses									(171.7)	(133.4)	(133.3)
Depreciation and amortization									(183.8)	(172.6)	(139.7)
Loss on disposal of assets									(4.6)	(0.7)	(2.6)
Government, class action, and related settlements									0.0	0.0	(7.5)
Professional fees—accounting, tax, and legal									0.0	(1.9)	(3.0)
Loss on early extinguishment of debt									(10.7)	(7.4)	(22.4)
Interest expense and amortization of debt discounts and fees									(154.4)	(172.1)	(142.9)
Net income attributable to noncontrolling interests									79.1	70.5	69.7
Tax reform impact on noncontrolling interests									(4.6)	0.0	0.0
Gain related to SCA equity interest									$ 0.0	$ 0.0	$ 3.2

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