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Business Combinations - Fair Value of Assets and Liabilities Assumed (Details) - USD ($) $ in Millions	Sep. 30, 2019	Jul. 31, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Goodwill	$ 2,305.2		$ 2,100.8
Inpatient Rehabilitation Segment [Member] \| Saint Alphonsus and Heritage Valley [Member]
Business Acquisition [Line Items]
Goodwill	4.8
Total assets acquired	5.3
Total liabilities assumed	0.2
Net assets acquired	5.1
Inpatient Rehabilitation Segment [Member] \| Saint Alphonsus and Heritage Valley [Member] \| Noncompete agreements [Member]
Business Acquisition [Line Items]
Identifiable intangible assets	0.1
Inpatient Rehabilitation Segment [Member] \| Saint Alphonsus and Heritage Valley [Member] \| Trade name [Member]
Business Acquisition [Line Items]
Identifiable intangible assets	0.4
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] \| 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] \| License [Member]
Business Acquisition [Line Items]
Identifiable intangible assets	$ 0.8
Home Health and Hospice Segment [Member] \| Alacare [Member]
Business Acquisition [Line Items]
Accounts receivable		$ 10.2
Prepaid expense and other current assets		1.7
Property and equipment, net		0.7
Goodwill		163.9
Other assets acquired		5.0
Total assets acquired		232.5
Current portion of long-term debt		0.3
Accounts payable		1.2
Accrued payroll		8.1
Other current liabilities		2.3
Long-term operating lease liabilities		3.1
Total liabilities assumed		15.0
Net assets acquired		217.5
Home Health and Hospice Segment [Member] \| Alacare [Member] \| Noncompete agreements [Member]
Business Acquisition [Line Items]
Identifiable intangible assets		1.0
Home Health and Hospice Segment [Member] \| Alacare [Member] \| Trade name [Member]
Business Acquisition [Line Items]
Identifiable intangible assets		1.0
Home Health and Hospice Segment [Member] \| Alacare [Member] \| Certificates of need [Member]
Business Acquisition [Line Items]
Identifiable intangible assets		34.3
Home Health and Hospice Segment [Member] \| Alacare [Member] \| License [Member]
Business Acquisition [Line Items]
Identifiable intangible assets		14.6
Home Health and Hospice Segment [Member] \| Alacare [Member] \| Internal-use software [Member]
Business Acquisition [Line Items]
Identifiable intangible assets		$ 0.1