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Basis of Presentation - Table 1 (Details) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2018 USD ($) state	Mar. 31, 2017 USD ($)	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Net operating revenues	$ 1,046.0	$ 957.1
Number of states in which entity operates | state	36
Inpatient Rehabilitation Segment [Member]
Disaggregation of Revenue [Line Items]
Net operating revenues	$ 840.3	777.8
Number of states in which entity operates | state	31
Home Health and Hospice Segment [Member]
Disaggregation of Revenue [Line Items]
Net operating revenues	$ 205.7	179.3
Number of states in which entity operates | state	28
Net operating revenues [Member] | Payor Source [Member]
Disaggregation of Revenue [Line Items]
Net operating revenues	$ 1,046.0	957.1
Net operating revenues [Member] | Other income [Member] | Payor Source [Member]
Disaggregation of Revenue [Line Items]
Net operating revenues	10.0	9.8
Net operating revenues [Member] | Inpatient Rehabilitation Segment [Member] | Payor Source [Member]
Disaggregation of Revenue [Line Items]
Net operating revenues	840.3	777.8
Net operating revenues [Member] | Inpatient Rehabilitation Segment [Member] | Other income [Member] | Payor Source [Member]
Disaggregation of Revenue [Line Items]
Net operating revenues	9.8	9.6
Net operating revenues [Member] | Home Health and Hospice Segment [Member] | Payor Source [Member]
Disaggregation of Revenue [Line Items]
Net operating revenues	205.7	179.3
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	0.2
Net operating revenues [Member] | Third-Party Payor [Member] | Medicare [Member] | Payor Source [Member]
Disaggregation of Revenue [Line Items]
Net operating revenues	801.4	726.0
Net operating revenues [Member] | Third-Party Payor [Member] | Medicare Advantage [Member] | Payor Source [Member]
Disaggregation of Revenue [Line Items]
Net operating revenues	92.5	83.0
Net operating revenues [Member] | Third-Party Payor [Member] | Managed Care [Member] | Payor Source [Member]
Disaggregation of Revenue [Line Items]
Net operating revenues	92.6	92.0
Net operating revenues [Member] | Third-Party Payor [Member] | Medicaid [Member] | Payor Source [Member]
Disaggregation of Revenue [Line Items]
Net operating revenues	25.2	22.8
Net operating revenues [Member] | Third-Party Payor [Member] | Other third-party payors [Member] | Payor Source [Member]
Disaggregation of Revenue [Line Items]
Net operating revenues	12.0	11.4
Net operating revenues [Member] | Third-Party Payor [Member] | Workers' compensation [Member] | Payor Source [Member]
Disaggregation of Revenue [Line Items]
Net operating revenues	7.5	7.5
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	624.5	573.7
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	72.5	64.8
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	85.0	84.9
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	24.7	21.6
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	12.0	11.4
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	7.4	7.4
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	176.9	152.3
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	20.0	18.2
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	7.6	7.1
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	0.5	1.2
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
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	0.1	0.1
Net operating revenues [Member] | Self-Pay [Member] | Patients [Member] | Payor Source [Member]
Disaggregation of Revenue [Line Items]
Net operating revenues	4.8	4.6
Net operating revenues [Member] | Self-Pay [Member] | Inpatient Rehabilitation Segment [Member] | Patients [Member] | Payor Source [Member]
Disaggregation of Revenue [Line Items]
Net operating revenues	4.4	4.4
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	$ 0.4	$ 0.2
Accounts receivable [Member] | Payor Source [Member]
Disaggregation of Revenue [Line Items]
Net operating revenues by payor source (percent)	100.00%		100.00%
Accounts receivable [Member] | Third-Party Payor [Member] | Medicare [Member] | Payor Source [Member]
Disaggregation of Revenue [Line Items]
Net operating revenues by payor source (percent)	73.20%		75.10%
Accounts receivable [Member] | Third-Party Payor [Member] | Managed Care, Medicare Advantage and Other Discount Plans [Member] | Payor Source [Member]
Disaggregation of Revenue [Line Items]
Net operating revenues by payor source (percent)	19.10%		17.40%
Accounts receivable [Member] | Third-Party Payor [Member] | Medicaid [Member] | Payor Source [Member]
Disaggregation of Revenue [Line Items]
Net operating revenues by payor source (percent)	2.60%		2.40%
Accounts receivable [Member] | Third-Party Payor [Member] | Other third-party payors [Member] | Payor Source [Member]
Disaggregation of Revenue [Line Items]
Net operating revenues by payor source (percent)	2.90%		2.90%
Accounts receivable [Member] | Third-Party Payor [Member] | Workers' compensation [Member] | Payor Source [Member]
Disaggregation of Revenue [Line Items]
Net operating revenues by payor source (percent)	1.30%		1.30%
Accounts receivable [Member] | Self-Pay [Member] | Patients [Member] | Payor Source [Member]
Disaggregation of Revenue [Line Items]
Net operating revenues by payor source (percent)	0.90%		0.90%

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