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Business Combinations - Fair Value of Assets and Liabilities Assumed (Details) - USD ($) $ in Millions	1 Months Ended	9 Months Ended
	Mar. 31, 2020	Sep. 30, 2020	Dec. 31, 2019
Business Acquisition [Line Items]
Goodwill		$ 2,318.7	$ 2,305.2
Inpatient Rehabilitation \| Portercare Adventist and Premier Health Partners
Business Acquisition [Line Items]
Property and equipment, net		0.1
Goodwill		9.2
Total assets acquired		10.9
Inpatient Rehabilitation \| Portercare Adventist and Premier Health Partners \| Noncompete Agreements
Business Acquisition [Line Items]
Identifiable intangible assets		0.7
Inpatient Rehabilitation \| Portercare Adventist and Premier Health Partners \| Trade Name
Business Acquisition [Line Items]
Identifiable intangible assets		$ 0.9
Finite-lived intangible asset useful life		20 years
Inpatient Rehabilitation \| Maximum \| Portercare Adventist and Premier Health Partners \| Noncompete Agreements
Business Acquisition [Line Items]
Finite-lived intangible asset useful life		3 years
Inpatient Rehabilitation \| Minimum \| Portercare Adventist and Premier Health Partners \| Noncompete Agreements
Business Acquisition [Line Items]
Finite-lived intangible asset useful life		2 years
Home Health and Hospice \| Generation Solutions of Lynchburg
Business Acquisition [Line Items]
Goodwill	$ 1.0
Total assets acquired	1.1
Home Health and Hospice \| Generation Solutions of Lynchburg \| Licensing Agreements
Business Acquisition [Line Items]
Identifiable intangible assets	$ 0.1
Finite-lived intangible asset useful life	10 years