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Segment Reporting - Table 5 (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Segment Reporting, Revenue Reconciling Item [Line Items]
Net operating revenues	$ 1,067.7	$ 966.4	$ 2,113.7	$ 1,923.5
Inpatient Rehabilitation Segment [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net operating revenues	834.6	777.6	1,674.9	1,555.4
Inpatient Rehabilitation Segment [Member] | Inpatient [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net operating revenues	809.6	751.5	1,626.7	1,504.2
Inpatient Rehabilitation Segment [Member] | Outpatient and other [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net operating revenues	25.0	26.1	48.2	51.2
Home Health and Hospice Segment [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net operating revenues	233.1	188.8	438.8	368.1
Home Health and Hospice Segment [Member] | Home health [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net operating revenues	204.8	171.9	390.1	335.8
Home Health and Hospice Segment [Member] | Hospice [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net operating revenues	$ 28.3	$ 16.9	$ 48.7	$ 32.3

X

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8933-108599

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599

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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.

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