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Basis of Presentation - Net Operating Revenues (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Disaggregation of Revenue [Line Items]
Net operating revenues	$ 1,161.6	$ 1,067.6	$ 3,420.6	$ 3,181.3
Inpatient Rehabilitation Segment [Member]
Disaggregation of Revenue [Line Items]
Net operating revenues	872.3	825.6	2,616.3	2,500.5
Home Health and Hospice Segment [Member]
Disaggregation of Revenue [Line Items]
Net operating revenues	289.3	242.0	804.3	680.8
Net operating revenues [Member] | Payor Source [Member]
Disaggregation of Revenue [Line Items]
Net operating revenues	1,161.6	1,067.6	3,420.6	3,181.3
Net operating revenues [Member] | Other income [Member] | Payor Source [Member]
Disaggregation of Revenue [Line Items]
Net operating revenues	12.9	15.6	37.2	37.3
Net operating revenues [Member] | Inpatient Rehabilitation Segment [Member] | Payor Source [Member]
Disaggregation of Revenue [Line Items]
Net operating revenues	872.3	825.6	2,616.3	2,500.5
Net operating revenues [Member] | Inpatient Rehabilitation Segment [Member] | Other income [Member] | Payor Source [Member]
Disaggregation of Revenue [Line Items]
Net operating revenues	12.7	15.3	36.4	36.6
Net operating revenues [Member] | Home Health and Hospice Segment [Member] | Payor Source [Member]
Disaggregation of Revenue [Line Items]
Net operating revenues	289.3	242.0	804.3	680.8
Net operating revenues [Member] | Home Health and Hospice Segment [Member] | Other income [Member] | Payor Source [Member]
Disaggregation of Revenue [Line Items]
Net operating revenues	0.2	0.3	0.8	0.7
Net operating revenues [Member] | Third-Party Payor [Member] | Medicare [Member] | Payor Source [Member]
Disaggregation of Revenue [Line Items]
Net operating revenues	872.9	806.2	2,577.2	2,413.9
Net operating revenues [Member] | Third-Party Payor [Member] | Medicare Advantage [Member] | Payor Source [Member]
Disaggregation of Revenue [Line Items]
Net operating revenues	119.9	97.7	353.6	290.7
Net operating revenues [Member] | Third-Party Payor [Member] | Managed Care [Member] | Payor Source [Member]
Disaggregation of Revenue [Line Items]
Net operating revenues	97.7	93.7	284.2	281.6
Net operating revenues [Member] | Third-Party Payor [Member] | Medicaid [Member] | Payor Source [Member]
Disaggregation of Revenue [Line Items]
Net operating revenues	32.8	29.8	95.2	84.5
Net operating revenues [Member] | Third-Party Payor [Member] | Other third-party payors [Member] | Payor Source [Member]
Disaggregation of Revenue [Line Items]
Net operating revenues	12.1	11.8	32.6	36.5
Net operating revenues [Member] | Third-Party Payor [Member] | Workers' compensation [Member] | Payor Source [Member]
Disaggregation of Revenue [Line Items]
Net operating revenues	7.2	7.4	22.3	21.9
Net operating revenues [Member] | Third-Party Payor [Member] | Inpatient Rehabilitation Segment [Member] | Medicare [Member] | Payor Source [Member]
Disaggregation of Revenue [Line Items]
Net operating revenues	624.5	600.5	1,892.8	1,832.1
Net operating revenues [Member] | Third-Party Payor [Member] | Inpatient Rehabilitation Segment [Member] | Medicare Advantage [Member] | Payor Source [Member]
Disaggregation of Revenue [Line Items]
Net operating revenues	94.7	75.0	276.2	226.2
Net operating revenues [Member] | Third-Party Payor [Member] | Inpatient Rehabilitation Segment [Member] | Managed Care [Member] | Payor Source [Member]
Disaggregation of Revenue [Line Items]
Net operating revenues	87.3	85.1	257.5	256.7
Net operating revenues [Member] | Third-Party Payor [Member] | Inpatient Rehabilitation Segment [Member] | Medicaid [Member] | Payor Source [Member]
Disaggregation of Revenue [Line Items]
Net operating revenues	28.0	25.7	81.4	77.2
Net operating revenues [Member] | Third-Party Payor [Member] | Inpatient Rehabilitation Segment [Member] | Other third-party payors [Member] | Payor Source [Member]
Disaggregation of Revenue [Line Items]
Net operating revenues	12.1	11.8	32.6	36.5
Net operating revenues [Member] | Third-Party Payor [Member] | Inpatient Rehabilitation Segment [Member] | Workers' compensation [Member] | Payor Source [Member]
Disaggregation of Revenue [Line Items]
Net operating revenues	6.9	6.9	21.6	21.1
Net operating revenues [Member] | Third-Party Payor [Member] | Home Health and Hospice Segment [Member] | Medicare [Member] | Payor Source [Member]
Disaggregation of Revenue [Line Items]
Net operating revenues	248.4	205.7	684.4	581.8
Net operating revenues [Member] | Third-Party Payor [Member] | Home Health and Hospice Segment [Member] | Medicare Advantage [Member] | Payor Source [Member]
Disaggregation of Revenue [Line Items]
Net operating revenues	25.2	22.7	77.4	64.5
Net operating revenues [Member] | Third-Party Payor [Member] | Home Health and Hospice Segment [Member] | Managed Care [Member] | Payor Source [Member]
Disaggregation of Revenue [Line Items]
Net operating revenues	10.4	8.6	26.7	24.9
Net operating revenues [Member] | Third-Party Payor [Member] | Home Health and Hospice Segment [Member] | Medicaid [Member] | Payor Source [Member]
Disaggregation of Revenue [Line Items]
Net operating revenues	4.8	4.1	13.8	7.3
Net operating revenues [Member] | Third-Party Payor [Member] | Home Health and Hospice Segment [Member] | Other third-party payors [Member] | Payor Source [Member]
Disaggregation of Revenue [Line Items]
Net operating revenues	0.0	0.0	0.0	0.0
Net operating revenues [Member] | Third-Party Payor [Member] | Home Health and Hospice Segment [Member] | Workers' compensation [Member] | Payor Source [Member]
Disaggregation of Revenue [Line Items]
Net operating revenues	0.3	0.5	0.7	0.8
Net operating revenues [Member] | Self-Pay [Member] | Patients [Member] | Payor Source [Member]
Disaggregation of Revenue [Line Items]
Net operating revenues	6.1	5.4	18.3	14.9
Net operating revenues [Member] | Self-Pay [Member] | Inpatient Rehabilitation Segment [Member] | Patients [Member] | Payor Source [Member]
Disaggregation of Revenue [Line Items]
Net operating revenues	6.1	5.3	17.8	14.1
Net operating revenues [Member] | Self-Pay [Member] | Home Health and Hospice Segment [Member] | Patients [Member] | Payor Source [Member]
Disaggregation of Revenue [Line Items]
Net operating revenues	$ 0.0	$ 0.1	$ 0.5	$ 0.8

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