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Business Combinations - Pro Forma Results of Operation (Details) - USD ($) $ in Millions	4 Months Ended	8 Months Ended	10 Months Ended	11 Months Ended	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2018	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
2018 Acquisitions [Member]
Business Acquisition [Line Items]
Business Acquisition, Pro Forma Revenue					$ 4,337.4	$ 4,039.9
Business Acquisition, Pro Forma Net Income (Loss)					300.0	289.0
2017 Acquisitions [Member]
Business Acquisition [Line Items]
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual				$ 32.9
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual				$ (6.3)
Business Acquisition, Pro Forma Revenue						3,996.1	$ 3,771.5
Business Acquisition, Pro Forma Net Income (Loss)						$ 260.3	254.8
2016 Acquisitions [Member]
Business Acquisition [Line Items]
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual			$ 27.4
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual			$ (2.2)
Business Acquisition, Pro Forma Revenue							3,745.6	$ 3,217.1
Business Acquisition, Pro Forma Net Income (Loss)							$ 252.2	$ 187.3
Inpatient Rehabilitation Segment [Member] | 2018 Acquisitions [Member]
Business Acquisition [Line Items]
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual	$ 9.1
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual	$ (1.6)
Home Health and Hospice Segment [Member] | 2018 Acquisitions [Member]
Business Acquisition [Line Items]
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual					3.5
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual					$ (0.3)
Home Health and Hospice Segment [Member] | Camellia Healthcare [Member]
Business Acquisition [Line Items]
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual		$ 50.0
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual		$ (0.9)

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