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Business Combinations - Fair Value of Assets and Liabilities Assumed (Details) - USD ($) $ in Millions	Sep. 30, 2018	May 01, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Goodwill	$ 2,081.1		$ 1,972.6
Inpatient Rehabilitation Segment [Member] \| Murrells Inlet [Member]
Business Acquisition [Line Items]
Goodwill	6.4
Total assets acquired	16.1
Inpatient Rehabilitation Segment [Member] \| Murrells Inlet [Member] \| Noncompete agreements [Member]
Business Acquisition [Line Items]
Identifiable intangible assets	0.6
Inpatient Rehabilitation Segment [Member] \| Murrells Inlet [Member] \| Trade name [Member]
Business Acquisition [Line Items]
Identifiable intangible assets	1.4
Inpatient Rehabilitation Segment [Member] \| Murrells Inlet [Member] \| Certificates of need [Member]
Business Acquisition [Line Items]
Identifiable intangible assets	7.7
Home Health and Hospice Segment [Member] \| Camellia Healthcare [Member]
Business Acquisition [Line Items]
Cash and cash equivalents		$ 1.3
Prepaid expenses and other current assets		0.3
Property and equipment, net		0.6
Goodwill		97.0
Total assets acquired		139.3
Accounts payable		4.3
Accrued payroll		4.0
Total liabilities assumed		8.3
Net assets acquired		131.0
Home Health and Hospice Segment [Member] \| Camellia Healthcare [Member] \| Noncompete agreements [Member]
Business Acquisition [Line Items]
Identifiable intangible assets		0.5
Home Health and Hospice Segment [Member] \| Camellia Healthcare [Member] \| Trade name [Member]
Business Acquisition [Line Items]
Identifiable intangible assets		1.4
Home Health and Hospice Segment [Member] \| Camellia Healthcare [Member] \| Certificates of need [Member]
Business Acquisition [Line Items]
Identifiable intangible assets		16.6
Home Health and Hospice Segment [Member] \| Camellia Healthcare [Member] \| Licenses [Member]
Business Acquisition [Line Items]
Identifiable intangible assets		$ 21.6
Home Health and Hospice Segment [Member] \| Golden Age and MSA [Member]
Business Acquisition [Line Items]
Goodwill	5.1
Total assets acquired	6.1
Home Health and Hospice Segment [Member] \| Golden Age and MSA [Member] \| Noncompete agreements [Member]
Business Acquisition [Line Items]
Identifiable intangible assets	0.2
Home Health and Hospice Segment [Member] \| Golden Age and MSA [Member] \| Licenses [Member]
Business Acquisition [Line Items]
Identifiable intangible assets	$ 0.8