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Business Combinations - Pro Forma Results of Operation (Details) - USD ($) $ in Millions	3 Months Ended		7 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2020	Sep. 30, 2019
Business Acquisition [Line Items]
Business acquisition, pro forma revenue	$ 1,173.9	$ 1,166.9		$ 3,435.9	$ 3,436.3
Business acquisition, pro forma net income	$ 77.7	$ 98.1		198.8	$ 292.6
Portercare Adventist and Premier Health Partners | 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
Generation Solutions of Lynchburg | Home Health and Hospice
Business Acquisition [Line Items]
Business combination, pro forma information, revenue of acquiree since acquisition date, actual			$ 1.1
Business combination, pro forma information, earnings of acquiree since acquisition date, actual			$ 0.0

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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.

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-Publisher FASB
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