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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, 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
Segment Reporting, Revenue Reconciling Item [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]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net operating revenues									3,346.2	3,141.3	2,964.1
Inpatient Rehabilitation Segment [Member] | Inpatient [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net operating revenues									3,247.9	3,039.3	2,853.9
Inpatient Rehabilitation Segment [Member] | Outpatient and other [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net operating revenues									98.3	102.0	110.2
Home Health and Hospice Segment [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net operating revenues									931.1	772.6	678.5
Home Health and Hospice Segment [Member] | Home health [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net operating revenues									814.6	702.4	630.8
Home Health and Hospice Segment [Member] | Hospice [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net operating revenues									$ 116.5	$ 70.2	$ 47.7

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- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

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