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Goodwill and Other Intangible Assets - Carrying Amounts of Goodwill (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Schedule of Changes in the Carrying Amount of Goodwill
Goodwill, Beginning Balance	$ 1,972.6	$ 1,927.2	$ 1,890.1
Acquisitions	128.2	45.4	51.4
Divestiture of pediatric home health services			(14.3)
Goodwill, Ending Balance	2,100.8	1,972.6	1,927.2
Inpatient Rehabilitation Segment [Member]
Schedule of Changes in the Carrying Amount of Goodwill
Goodwill, Beginning Balance	1,166.0	1,142.0	1,133.1
Acquisitions	23.2	24.0	8.9
Divestiture of pediatric home health services			0.0
Goodwill, Ending Balance	1,189.2	1,166.0	1,142.0
Home Health and Hospice Segment [Member]
Schedule of Changes in the Carrying Amount of Goodwill
Goodwill, Beginning Balance	806.6	785.2	757.0
Acquisitions	105.0	21.4	42.5
Divestiture of pediatric home health services			(14.3)
Goodwill, Ending Balance	$ 911.6	$ 806.6	$ 785.2

X

- 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://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=77989000&loc=SL49117168-202975

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X

- 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
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-SubTopic 20
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-Paragraph 1
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- Definition

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- Definition

Amount of divestiture 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

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