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Goodwill and Other Intangible Assets - Carrying Amounts of Goodwill (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Schedule of Changes in the Carrying Amount of Goodwill
Goodwill, beginning balance	$ 2,305.2	$ 2,100.8	$ 1,972.6
Acquisitions	10.2	179.5	128.2
Consolidation of joint venture formerly accounted for under the equity method of accounting	3.3	24.9
Goodwill, ending balance	2,318.7	2,305.2	2,100.8
Inpatient Rehabilitation
Schedule of Changes in the Carrying Amount of Goodwill
Goodwill, beginning balance	1,218.9	1,189.2	1,166.0
Acquisitions	9.2	4.8	23.2
Consolidation of joint venture formerly accounted for under the equity method of accounting	0.0	24.9
Goodwill, ending balance	1,228.1	1,218.9	1,189.2
Home Health and Hospice
Schedule of Changes in the Carrying Amount of Goodwill
Goodwill, beginning balance	1,086.3	911.6	806.6
Acquisitions	1.0	174.7	105.0
Consolidation of joint venture formerly accounted for under the equity method of accounting	3.3	0.0
Goodwill, ending balance	$ 1,090.6	$ 1,086.3	$ 911.6

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- Definition

Goodwill, Consolidation Of Joint Venture Formerly Accounted For Under Equity Method

+ References

No definition available.

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- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(10)(1))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=120320667&loc=SL49117168-202975

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266

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- Definition

Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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