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Segment Reporting - Revenues of Operating Segments by Service Line (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting, Revenue Reconciling Item [Line Items]
Net operating revenues	$ 1,184.4	$ 1,161.6	$ 1,135.0	$ 1,124.0	$ 1,096.0	$ 1,067.6	$ 1,067.7	$ 1,046.0	$ 4,605.0	$ 4,277.3	$ 3,913.9
Inpatient Rehabilitation
Segment Reporting, Revenue Reconciling Item [Line Items]
Net operating revenues									3,513.0	3,346.2	3,141.3
Inpatient Rehabilitation | Inpatient
Segment Reporting, Revenue Reconciling Item [Line Items]
Net operating revenues									3,423.5	3,247.9	3,039.3
Inpatient Rehabilitation | Outpatient and other
Segment Reporting, Revenue Reconciling Item [Line Items]
Net operating revenues									89.5	98.3	102.0
Home Health and Hospice Segment
Segment Reporting, Revenue Reconciling Item [Line Items]
Net operating revenues									1,092.0	931.1	772.6
Home Health and Hospice Segment | Home health
Segment Reporting, Revenue Reconciling Item [Line Items]
Net operating revenues									918.0	814.6	702.4
Home Health and Hospice Segment | Hospice
Segment Reporting, Revenue Reconciling Item [Line Items]
Net operating revenues									$ 174.0	$ 116.5	$ 70.2

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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://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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+ References

No definition available.

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