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Goodwill and Other Intangible Assets - Carrying Amounts of Goodwill (Details) - USD ($) $ in Millions	12 Months Ended
	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

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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.

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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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