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Segment Reporting Segment Reporting - Revenues of Operating Segments by Service Line (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting, Revenue Reconciling Item [Line Items]
Net operating revenues	$ 1,019.7	$ 995.6	$ 981.3	$ 974.8	$ 949.9	$ 926.8	$ 920.7	$ 909.8	$ 3,971.4	$ 3,707.2	$ 3,162.9
Inpatient Rehabilitation Segment [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net operating revenues									3,188.1	3,021.1	2,653.1
Inpatient Rehabilitation Segment [Member] | Inpatient [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net operating revenues									3,082.4	2,905.5	2,547.2
Inpatient Rehabilitation Segment [Member] | Outpatient and other [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net operating revenues									105.7	115.6	105.9
Home Health and Hospice Segment [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net operating revenues									783.3	686.1	509.8
Home Health and Hospice Segment [Member] | Home health [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net operating revenues									706.7	635.2	478.1
Home Health and Hospice Segment [Member] | Hospice [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net operating revenues									$ 76.6	$ 50.9	$ 31.7

X

- Definition

Amount of revenues recognized by the entity from providing services to in-patients, outpatients, residents in facilities owned or operated by the entity, from insurance premiums, or from goods provided or services performed.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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