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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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Segment Reporting - Reconciliation of Adjusted EBITDA (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
General and administrative expenses									$ (247,000,000.0)	$ (220,200,000)	$ (171,700,000)
Depreciation and amortization									(218,700,000)	(199,700,000)	(183,800,000)
Government, class action, and related settlements									0	(52,000,000.0)	0
Loss on early extinguishment of debt									(7,700,000)	0	(10,700,000)
Net income attributable to noncontrolling interests	$ (22,600,000)	$ (21,900,000)	$ (19,700,000)	$ (22,900,000)	$ (19,600,000)	$ (20,700,000)	$ (21,400,000)	$ (21,400,000)	(87,100,000)	(83,100,000)	(79,100,000)
Gain on consolidation of Yuma									19,200,000	0	0
Income from continuing operations before income tax expense									562,300,000	493,200,000	496,400,000
Inpatient Rehabilitation Hospital and Home Health and Hospice
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total segment Adjusted EBITDA									1,095,400,000	1,034,300,000	947,100,000
Segment Reconciling Items
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
General and administrative expenses									(247,000,000.0)	(220,200,000)	(171,700,000)
Depreciation and amortization									(218,700,000)	(199,700,000)	(183,800,000)
Loss on disposal of assets									(11,100,000)	(5,700,000)	(4,600,000)
Government, class action, and related settlements									0	(52,000,000.0)	0
Loss on early extinguishment of debt									(7,700,000)	0	(10,700,000)
Interest expense and amortization of debt discounts and fees									(159,700,000)	(147,300,000)	(154,400,000)
Net income attributable to noncontrolling interests									87,100,000	83,100,000	79,100,000
SARs mark-to-market impact on noncontrolling interests									5,000,000.0	2,600,000	0
Change in fair market value of equity securities									800,000	(1,900,000)	0
Tax reform impact on noncontrolling interests									0	0	(4,600,000)
Gain on consolidation of Yuma									19,200,000	0	0
Payroll taxes on SARs exercise									$ (1,000,000.0)	$ 0	$ 0