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Business Combinations - Pro Forma Results of Operation (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		21 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021
Business Acquisition [Line Items]
Business acquisition, pro forma revenue	$ 1,284.8	$ 1,186.8	$ 3,825.7	$ 3,468.7
Business acquisition, pro forma net income	$ 100.0	$ 78.4	$ 322.1	$ 200.4
Inpatient Rehabilitation
Business Acquisition [Line Items]
Business combination, pro forma information, revenue of acquiree since acquisition date, actual					$ 0.0
Business combination, pro forma information, earnings of acquiree since acquisition date, actual					0.0
Home Health and Hospice
Business Acquisition [Line Items]
Business combination, pro forma information, revenue of acquiree since acquisition date, actual					11.6
Business combination, pro forma information, earnings of acquiree since acquisition date, actual					$ (0.3)

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The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
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