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Business Combinations - Fair Value of Assets and Liabilities Assumed (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Goodwill	$ 2,111.6	$ 2,100.8
Home Health and Hospice Segment [Member] | Certificates of need [Member]
Business Acquisition [Line Items]
Identifiable intangible assets	2.0
Home Health and Hospice Segment [Member] | Tidewater and Care Resource Group [Member]
Business Acquisition [Line Items]
Goodwill	10.8
Other assets acquired	0.2
Total assets acquired	14.0
Accrued payroll	(0.1)
Other current liabilities	(0.1)
Other long-term liabilities	(0.1)
Total liabilities assumed	(0.3)
Net assets acquired	13.7
Home Health and Hospice Segment [Member] | Tidewater and Care Resource Group [Member] | Noncompete agreements [Member]
Business Acquisition [Line Items]
Identifiable intangible assets	0.2
Home Health and Hospice Segment [Member] | Tidewater and Care Resource Group [Member] | License [Member]
Business Acquisition [Line Items]
Identifiable intangible assets	$ 0.8

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