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Goodwill and Other Intangible Assets - Carrying Amounts of Goodwill (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Schedule of Changes in the Carrying Amount of Goodwill |  |  |
Goodwill, Beginning Balance | $ 1,890.1 | $ 1,084.0 | $ 456.9
Acquisitions | 51.4 | 806.1 | 593.1
Consolidation of joint venture formerly accounted for under the equity method of accounting |  |  | 34.0
Divestiture of pediatric home health services | (14.3) |  |
Goodwill, Ending Balance | 1,927.2 | 1,890.1 | 1,084.0
Inpatient Rehabilitation Segment [Member] |  |  |
Schedule of Changes in the Carrying Amount of Goodwill |  |  |
Goodwill, Beginning Balance | 1,133.1 | 491.5 | 456.9
Acquisitions | 8.9 | 641.6 | 0.6
Consolidation of joint venture formerly accounted for under the equity method of accounting |  |  | 34.0
Divestiture of pediatric home health services | 0.0 |  |
Goodwill, Ending Balance | 1,142.0 | 1,133.1 | 491.5
Home Health and Hospice Segment [Member] |  |  |
Schedule of Changes in the Carrying Amount of Goodwill |  |  |
Goodwill, Beginning Balance | 757.0 | 592.5 | 0.0
Acquisitions | 42.5 | 164.5 | 592.5
Consolidation of joint venture formerly accounted for under the equity method of accounting |  |  | 0.0
Divestiture of pediatric home health services | (14.3) |  |
Goodwill, Ending Balance | $ 785.2 | $ 757.0 | $ 592.5

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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/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=64834752&loc=SL49117168-202975 + Details
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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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