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Business Combinations - Pro Forma Results of Operation (Details) - USD ($) $ in Millions	10 Months Ended	11 Months Ended	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
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
2015 Acquisitions [Member]
Business Acquisition [Line Items]
Business Acquisition, Pro Forma Revenue					3,479.9	$ 2,851.0
Business Acquisition, Pro Forma Net Income (Loss)					234.0	$ 276.9
Inpatient Rehabilitation Segment [Member] | Series of individually immaterial business acquisitions [Member]
Business Acquisition [Line Items]
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual					54.7
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual					1.7
Inpatient Rehabilitation Segment [Member] | Reliant [Member]
Business Acquisition [Line Items]
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual					63.7
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual					11.2
Home Health and Hospice Segment [Member] | Series of individually immaterial business acquisitions [Member]
Business Acquisition [Line Items]
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual					17.8
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual					1.2
Home Health and Hospice Segment [Member] | CareSouth [Member]
Business Acquisition [Line Items]
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual					19.2
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual					$ 2.5

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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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(2)-(3)
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