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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, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Schedule of Changes in the Carrying Amount of Goodwill |  |  |
Goodwill, beginning balance | $ 2,318.7 | $ 2,305.2 | $ 2,100.8
Acquisitions | 101.2 | 10.2 | 179.5
Consolidation of joint venture formerly accounted for under the equity method of accounting | 8.0 | 3.3 | 24.9
Goodwill, ending balance | 2,427.9 | 2,318.7 | 2,305.2
Inpatient Rehabilitation |  |  |
Schedule of Changes in the Carrying Amount of Goodwill |  |  |
Goodwill, beginning balance | 1,228.1 | 1,218.9 | 1,189.2
Acquisitions | 8.8 | 9.2 | 4.8
Consolidation of joint venture formerly accounted for under the equity method of accounting | 0.0 | 0.0 | 24.9
Goodwill, ending balance | 1,236.9 | 1,228.1 | 1,218.9
Home Health and Hospice |  |  |
Schedule of Changes in the Carrying Amount of Goodwill |  |  |
Goodwill, beginning balance | 1,090.6 | 1,086.3 | 911.6
Acquisitions | 92.4 | 1.0 | 174.7
Consolidation of joint venture formerly accounted for under the equity method of accounting | 8.0 | 3.3 | 0.0
Goodwill, ending balance | $ 1,191.0 | $ 1,090.6 | $ 1,086.3

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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 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=84165509&loc=d3e56426-112766 Reference 4: 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=121556970&loc=d3e13816-109267 + Details
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