Segment Reporting - Reconciliation of reportable to Consolidated Assets (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets for reportable segments	[1]	$ 6,080.7	$ 5,175.0
Reclassification of noncurrent deferred income tax liabilities to net noncurrent deferred income tax assets		(33.5)	(40.5)
Total assets	[1]	6,080.7	5,175.0
Inpatient Rehabilitation Hospital and Home Health and Hospice
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets for reportable segments		6,114.2	5,215.5
Total assets		$ 6,114.2	$ 5,215.5

[1] Our consolidated assets as of December 31, 2019 and December 31, 2018 include total assets of variable interest entities of $215.0 million and $197.5 million, respectively, which cannot be used by us to settle the obligations of other entities. Our consolidated liabilities as of December 31, 2019 and December 31, 2018 include total liabilities of the variable interest entities of $41.1 million and $50.8 million, respectively. See Note 3, Variable Interest Entities.