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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Schedule of Changes in the Carrying Amount of Goodwill |  |  |
Goodwill, beginning balance | $ 2,100.8 | $ 1,972.6 | $ 1,927.2
Acquisitions | 179.5 | 128.2 | 45.4
Consolidation of joint venture formerly accounted for under the equity method of accounting | 24.9 |  |
Goodwill, ending balance | 2,305.2 | 2,100.8 | 1,972.6
Inpatient Rehabilitation |  |  |
Schedule of Changes in the Carrying Amount of Goodwill |  |  |
Goodwill, beginning balance | 1,189.2 | 1,166.0 | 1,142.0
Acquisitions | 4.8 | 23.2 | 24.0
Consolidation of joint venture formerly accounted for under the equity method of accounting | 24.9 |  |
Goodwill, ending balance | 1,218.9 | 1,189.2 | 1,166.0
Home Health and Hospice |  |  |
Schedule of Changes in the Carrying Amount of Goodwill |  |  |
Goodwill, beginning balance | 911.6 | 806.6 | 785.2
Acquisitions | 174.7 | 105.0 | 21.4
Consolidation of joint venture formerly accounted for under the equity method of accounting | 0.0 |  |
Goodwill, ending balance | $ 1,086.3 | $ 911.6 | $ 806.6

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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://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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 + 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://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=108376223&loc=d3e13816-109267 + Details
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