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Basis of Presentation - Net Operating Revenues (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Disaggregation of Revenue [Line Items]
Net operating revenues	$ 1,135.0	$ 1,067.7	$ 2,259.0	$ 2,113.7
Inpatient Rehabilitation Segment [Member]
Disaggregation of Revenue [Line Items]
Net operating revenues	873.9	834.6	1,744.0	1,674.9
Home Health and Hospice Segment [Member]
Disaggregation of Revenue [Line Items]
Net operating revenues	261.1	233.1	515.0	438.8
Net operating revenues [Member] | Payor Source [Member]
Disaggregation of Revenue [Line Items]
Net operating revenues	1,135.0	1,067.7	2,259.0	2,113.7
Net operating revenues [Member] | Other income [Member] | Payor Source [Member]
Disaggregation of Revenue [Line Items]
Net operating revenues	12.0	11.7	24.3	21.7
Net operating revenues [Member] | Inpatient Rehabilitation Segment [Member] | Payor Source [Member]
Disaggregation of Revenue [Line Items]
Net operating revenues	873.9	834.6	1,744.0	1,674.9
Net operating revenues [Member] | Inpatient Rehabilitation Segment [Member] | Other income [Member] | Payor Source [Member]
Disaggregation of Revenue [Line Items]
Net operating revenues	11.7	11.5	23.7	21.3
Net operating revenues [Member] | Home Health and Hospice Segment [Member] | Payor Source [Member]
Disaggregation of Revenue [Line Items]
Net operating revenues	261.1	233.1	515.0	438.8
Net operating revenues [Member] | Home Health and Hospice Segment [Member] | Other income [Member] | Payor Source [Member]
Disaggregation of Revenue [Line Items]
Net operating revenues	0.3	0.2	0.6	0.4
Net operating revenues [Member] | Third-Party Payor [Member] | Medicare [Member] | Payor Source [Member]
Disaggregation of Revenue [Line Items]
Net operating revenues	850.1	806.3	1,704.5	1,607.7
Net operating revenues [Member] | Third-Party Payor [Member] | Medicare Advantage [Member] | Payor Source [Member]
Disaggregation of Revenue [Line Items]
Net operating revenues	123.7	100.5	233.7	193.0
Net operating revenues [Member] | Third-Party Payor [Member] | Managed Care [Member] | Payor Source [Member]
Disaggregation of Revenue [Line Items]
Net operating revenues	94.5	95.3	186.4	187.9
Net operating revenues [Member] | Third-Party Payor [Member] | Medicaid [Member] | Payor Source [Member]
Disaggregation of Revenue [Line Items]
Net operating revenues	31.7	29.5	62.3	54.7
Net operating revenues [Member] | Third-Party Payor [Member] | Other third-party payors [Member] | Payor Source [Member]
Disaggregation of Revenue [Line Items]
Net operating revenues	10.5	12.7	20.5	24.7
Net operating revenues [Member] | Third-Party Payor [Member] | Workers' compensation [Member] | Payor Source [Member]
Disaggregation of Revenue [Line Items]
Net operating revenues	6.8	7.0	15.1	14.5
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	629.0	607.1	1,268.4	1,231.6
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	97.0	78.7	181.5	151.2
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	86.5	86.6	170.1	171.6
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	27.1	26.8	53.4	51.5
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	10.5	12.7	20.5	24.7
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	6.5	6.8	14.7	14.2
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	221.1	199.2	436.1	376.1
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	26.7	21.8	52.2	41.8
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	8.0	8.7	16.3	16.3
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	4.6	2.7	8.9	3.2
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	0.2	0.4	0.3
Net operating revenues [Member] | Self-Pay [Member] | Patients [Member] | Payor Source [Member]
Disaggregation of Revenue [Line Items]
Net operating revenues	5.7	4.7	12.2	9.5
Net operating revenues [Member] | Self-Pay [Member] | Inpatient Rehabilitation Segment [Member] | Patients [Member] | Payor Source [Member]
Disaggregation of Revenue [Line Items]
Net operating revenues	5.6	4.4	11.7	8.8
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	$ 0.1	$ 0.3	$ 0.5	$ 0.7

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