Goodwill and Other Intangible Assets - Carrying Amounts of Goodwill (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Schedule of Changes in the Carrying Amount of Goodwill
Goodwill, Beginning Balance	$ 1,927.2	$ 1,890.1	$ 1,084.0
Acquisitions	45.4	51.4	806.1
Divestiture of pediatric home health services		(14.3)
Goodwill, Ending Balance	1,972.6	1,927.2	1,890.1
Inpatient Rehabilitation Segment [Member]
Schedule of Changes in the Carrying Amount of Goodwill
Goodwill, Beginning Balance	1,142.0	1,133.1	491.5
Acquisitions	24.0	8.9	641.6
Divestiture of pediatric home health services		0.0
Goodwill, Ending Balance	1,166.0	1,142.0	1,133.1
Home Health and Hospice Segment [Member]
Schedule of Changes in the Carrying Amount of Goodwill
Goodwill, Beginning Balance	785.2	757.0	592.5
Acquisitions	21.4	42.5	164.5
Divestiture of pediatric home health services		(14.3)
Goodwill, Ending Balance	$ 806.6	$ 785.2	$ 757.0

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.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-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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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.

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- Definition

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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.

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