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Basis of Presentation - Table 1 (Details) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018 USD ($) state	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) state	Jun. 30, 2017 USD ($)	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Net operating revenues	$ 1,067.7	$ 966.4	$ 2,113.7	$ 1,923.5
Number of states in which entity operates | state	36		36
Inpatient Rehabilitation Segment [Member]
Disaggregation of Revenue [Line Items]
Net operating revenues	$ 834.6	777.6	$ 1,674.9	1,555.4
Number of states in which entity operates | state	31		31
Home Health and Hospice Segment [Member]
Disaggregation of Revenue [Line Items]
Net operating revenues	$ 233.1	188.8	$ 438.8	368.1
Number of states in which entity operates | state	30		30
Net operating revenues [Member] | Payor Source [Member]
Disaggregation of Revenue [Line Items]
Net operating revenues	$ 1,067.7	966.4	$ 2,113.7	1,923.5
Net operating revenues [Member] | Other income [Member] | Payor Source [Member]
Disaggregation of Revenue [Line Items]
Net operating revenues	11.7	10.1	21.7	19.9
Net operating revenues [Member] | Inpatient Rehabilitation Segment [Member] | Payor Source [Member]
Disaggregation of Revenue [Line Items]
Net operating revenues	834.6	777.6	1,674.9	1,555.4
Net operating revenues [Member] | Inpatient Rehabilitation Segment [Member] | Other income [Member] | Payor Source [Member]
Disaggregation of Revenue [Line Items]
Net operating revenues	11.5	9.9	21.3	19.5
Net operating revenues [Member] | Home Health and Hospice Segment [Member] | Payor Source [Member]
Disaggregation of Revenue [Line Items]
Net operating revenues	233.1	188.8	438.8	368.1
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	0.4	0.4
Net operating revenues [Member] | Third-Party Payor [Member] | Medicare [Member] | Payor Source [Member]
Disaggregation of Revenue [Line Items]
Net operating revenues	806.3	730.7	1,607.7	1,456.7
Net operating revenues [Member] | Third-Party Payor [Member] | Medicare Advantage [Member] | Payor Source [Member]
Disaggregation of Revenue [Line Items]
Net operating revenues	100.5	86.2	193.0	169.2
Net operating revenues [Member] | Third-Party Payor [Member] | Managed Care [Member] | Payor Source [Member]
Disaggregation of Revenue [Line Items]
Net operating revenues	95.3	91.9	187.9	183.9
Net operating revenues [Member] | Third-Party Payor [Member] | Medicaid [Member] | Payor Source [Member]
Disaggregation of Revenue [Line Items]
Net operating revenues	29.5	24.3	54.7	47.1
Net operating revenues [Member] | Third-Party Payor [Member] | Other third-party payors [Member] | Payor Source [Member]
Disaggregation of Revenue [Line Items]
Net operating revenues	12.7	12.5	24.7	23.9
Net operating revenues [Member] | Third-Party Payor [Member] | Workers' compensation [Member] | Payor Source [Member]
Disaggregation of Revenue [Line Items]
Net operating revenues	7.0	6.5	14.5	14.0
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	607.1	569.2	1,231.6	1,142.9
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	78.7	67.1	151.2	131.9
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	86.6	85.3	171.6	170.2
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	26.8	23.1	51.5	44.7
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	12.7	12.5	24.7	23.9
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	6.8	6.5	14.2	13.9
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	199.2	161.5	376.1	313.8
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	21.8	19.1	41.8	37.3
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	8.7	6.6	16.3	13.7
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	2.7	1.2	3.2	2.4
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	0.2	0.0	0.3	0.1
Net operating revenues [Member] | Self-Pay [Member] | Patients [Member] | Payor Source [Member]
Disaggregation of Revenue [Line Items]
Net operating revenues	4.7	4.2	9.5	8.8
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	4.0	8.8	8.4
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	$ 0.3	$ 0.2	$ 0.7	$ 0.4
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)			72.90%		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)			19.20%		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)			2.90%		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)			1.20%		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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