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Summary of Significant Accounting Policies - Net Operating Revenues & Accounts Receivable (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Concentration Risk [Line Items]
Net operating revenues	$ 1,096.0	$ 1,067.6	$ 1,067.7	$ 1,046.0	$ 1,008.8	$ 981.6	$ 966.4	$ 957.1	$ 4,277.3	$ 3,913.9	$ 3,642.6
Inpatient Rehabilitation Segment [Member]
Concentration Risk [Line Items]
Net operating revenues									3,346.2	3,141.3	2,964.1
Home Health and Hospice Segment [Member]
Concentration Risk [Line Items]
Net operating revenues									931.1	772.6	678.5
Payor Source [Member] | Revenue from Contract with Customer [Member]
Concentration Risk [Line Items]
Net operating revenues									4,277.3	3,913.9	3,642.6
Payor Source [Member] | Revenue from Contract with Customer [Member] | Inpatient Rehabilitation Segment [Member]
Concentration Risk [Line Items]
Net operating revenues									3,346.2	3,141.3	2,964.4
Payor Source [Member] | Revenue from Contract with Customer [Member] | Home Health and Hospice Segment [Member]
Concentration Risk [Line Items]
Net operating revenues									931.1	772.6	678.2
Payor Source [Member] | Revenue from Contract with Customer [Member] | Medicare [Member] | Third-Party Payor [Member]
Concentration Risk [Line Items]
Net operating revenues									3,246.2	2,976.5	2,753.7
Payor Source [Member] | Revenue from Contract with Customer [Member] | Medicare [Member] | Third-Party Payor [Member] | Inpatient Rehabilitation Segment [Member]
Concentration Risk [Line Items]
Net operating revenues									2,451.7	2,313.6	2,187.8
Payor Source [Member] | Revenue from Contract with Customer [Member] | Medicare [Member] | Third-Party Payor [Member] | Home Health and Hospice Segment [Member]
Concentration Risk [Line Items]
Net operating revenues									794.5	662.9	565.9
Payor Source [Member] | Revenue from Contract with Customer [Member] | Medicare Advantage [Member] | Third-Party Payor [Member]
Concentration Risk [Line Items]
Net operating revenues									395.1	335.8	285.9
Payor Source [Member] | Revenue from Contract with Customer [Member] | Medicare Advantage [Member] | Third-Party Payor [Member] | Inpatient Rehabilitation Segment [Member]
Concentration Risk [Line Items]
Net operating revenues									306.5	261.0	226.9
Payor Source [Member] | Revenue from Contract with Customer [Member] | Medicare Advantage [Member] | Third-Party Payor [Member] | Home Health and Hospice Segment [Member]
Concentration Risk [Line Items]
Net operating revenues									88.6	74.8	59.0
Payor Source [Member] | Revenue from Contract with Customer [Member] | Managed Care [Member] | Third-Party Payor [Member]
Concentration Risk [Line Items]
Net operating revenues									376.5	364.7	351.6
Payor Source [Member] | Revenue from Contract with Customer [Member] | Managed Care [Member] | Third-Party Payor [Member] | Inpatient Rehabilitation Segment [Member]
Concentration Risk [Line Items]
Net operating revenues									343.3	335.6	325.4
Payor Source [Member] | Revenue from Contract with Customer [Member] | Managed Care [Member] | Third-Party Payor [Member] | Home Health and Hospice Segment [Member]
Concentration Risk [Line Items]
Net operating revenues									33.2	29.1	26.2
Payor Source [Member] | Revenue from Contract with Customer [Member] | Medicaid [Member] | Third-Party Payor [Member]
Concentration Risk [Line Items]
Net operating revenues									112.9	97.5	110.3
Payor Source [Member] | Revenue from Contract with Customer [Member] | Medicaid [Member] | Third-Party Payor [Member] | Inpatient Rehabilitation Segment [Member]
Concentration Risk [Line Items]
Net operating revenues									101.3	93.2	84.5
Payor Source [Member] | Revenue from Contract with Customer [Member] | Medicaid [Member] | Third-Party Payor [Member] | Home Health and Hospice Segment [Member]
Concentration Risk [Line Items]
Net operating revenues									11.6	4.3	25.8
Payor Source [Member] | Revenue from Contract with Customer [Member] | Other Third-party Payors [Member] | Third-Party Payor [Member]
Concentration Risk [Line Items]
Net operating revenues									49.0	49.9	50.3
Payor Source [Member] | Revenue from Contract with Customer [Member] | Other Third-party Payors [Member] | Third-Party Payor [Member] | Inpatient Rehabilitation Segment [Member]
Concentration Risk [Line Items]
Net operating revenues									49.0	49.9	50.3
Payor Source [Member] | Revenue from Contract with Customer [Member] | Other Third-party Payors [Member] | Third-Party Payor [Member] | Home Health and Hospice Segment [Member]
Concentration Risk [Line Items]
Net operating revenues									0.0	0.0	0.0
Payor Source [Member] | Revenue from Contract with Customer [Member] | Workers' Compensation [Member] | Third-Party Payor [Member]
Concentration Risk [Line Items]
Net operating revenues									28.9	27.6	29.7
Payor Source [Member] | Revenue from Contract with Customer [Member] | Workers' Compensation [Member] | Third-Party Payor [Member] | Inpatient Rehabilitation Segment [Member]
Concentration Risk [Line Items]
Net operating revenues									27.4	27.5	29.6
Payor Source [Member] | Revenue from Contract with Customer [Member] | Workers' Compensation [Member] | Third-Party Payor [Member] | Home Health and Hospice Segment [Member]
Concentration Risk [Line Items]
Net operating revenues									1.5	0.1	0.1
Payor Source [Member] | Revenue from Contract with Customer [Member] | Patients [Member] | Self-Pay [Member]
Concentration Risk [Line Items]
Net operating revenues									19.5	19.1	18.4
Payor Source [Member] | Revenue from Contract with Customer [Member] | Patients [Member] | Self-Pay [Member] | Inpatient Rehabilitation Segment [Member]
Concentration Risk [Line Items]
Net operating revenues									18.7	18.4	17.9
Payor Source [Member] | Revenue from Contract with Customer [Member] | Patients [Member] | Self-Pay [Member] | Home Health and Hospice Segment [Member]
Concentration Risk [Line Items]
Net operating revenues									0.8	0.7	0.5
Payor Source [Member] | Revenue from Contract with Customer [Member] | Other Income Source [Member]
Concentration Risk [Line Items]
Net operating revenues									49.2	42.8	42.7
Payor Source [Member] | Revenue from Contract with Customer [Member] | Other Income Source [Member] | Inpatient Rehabilitation Segment [Member]
Concentration Risk [Line Items]
Net operating revenues									48.3	42.1	42.0
Payor Source [Member] | Revenue from Contract with Customer [Member] | Other Income Source [Member] | Home Health and Hospice Segment [Member]
Concentration Risk [Line Items]
Net operating revenues									$ 0.9	$ 0.7	$ 0.7
Payor Source [Member] | Accounts Receivable [Member]
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)									100.00%	100.00%
Payor Source [Member] | Accounts Receivable [Member] | Medicare [Member] | Third-Party Payor [Member]
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)									73.20%	75.10%
Payor Source [Member] | Accounts Receivable [Member] | Managed Care and Other Discount Plans, including Medicare Advantage [Member] | Third-Party Payor [Member]
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)									19.30%	17.40%
Payor Source [Member] | Accounts Receivable [Member] | Medicaid [Member] | Third-Party Payor [Member]
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)									2.80%	2.40%
Payor Source [Member] | Accounts Receivable [Member] | Other Third-party Payors [Member] | Third-Party Payor [Member]
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)									2.70%	2.90%
Payor Source [Member] | Accounts Receivable [Member] | Workers' Compensation [Member] | Third-Party Payor [Member]
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)									1.10%	1.30%
Payor Source [Member] | Accounts Receivable [Member] | Patients [Member] | Self-Pay [Member]
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)									0.90%	0.90%

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