|**Segment Reporting - Segment Reporting Information, Total Assets and Investments In and Advances to Nonconsolidated Affiliates (Details) - USD ($) $ in Millions**                                                                                                                                                                                                                                                                                                                        | Sep. 30, 2020                                                                                                                                                                                                                                                                                                                                                                                                                                                                          | Dec. 31, 2019                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|**Segment Reporting, Asset Reconciling Item [Line Items]**                                                                                                                                                                                                                                                                                                                                                                                                                                 |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
|Total assets                                                                                                                                                                                                                                                                                                                                                                                                                                                                               | [1]                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    | $ 6,610.5                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|Investments in and advances to nonconsolidated affiliates                                                                                                                                                                                                                                                                                                                                                                                                                                  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        | 5.6                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|Inpatient Rehabilitation                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
|**Segment Reporting, Asset Reconciling Item [Line Items]**                                                                                                                                                                                                                                                                                                                                                                                                                                 |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
|Total assets                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        | 5,058.9                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
|Investments in and advances to nonconsolidated affiliates                                                                                                                                                                                                                                                                                                                                                                                                                                  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        | 1.7                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|Home Health and Hospice                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
|**Segment Reporting, Asset Reconciling Item [Line Items]**                                                                                                                                                                                                                                                                                                                                                                                                                                 |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
|Total assets                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        | 1,611.9                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
|Investments in and advances to nonconsolidated affiliates                                                                                                                                                                                                                                                                                                                                                                                                                                  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        | $ 3.9                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
|[1]
Our consolidated assets as of September 30, 2020 and December 31, 2019 include total assets of variable interest entities of $222.0 million and $215.0 million, respectively, which cannot be used by us to settle the obligations of other entities. Our consolidated liabilities as of September 30, 2020 and December 31, 2019 include total liabilities of the variable interest entities of $44.6 million and $41.1 million, respectively. See Note 3,Variable Interest Entities. | [1]                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    | Our consolidated assets as of September 30, 2020 and December 31, 2019 include total assets of variable interest entities of $222.0 million and $215.0 million, respectively, which cannot be used by us to settle the obligations of other entities. Our consolidated liabilities as of September 30, 2020 and December 31, 2019 include total liabilities of the variable interest entities of $44.6 million and $41.1 million, respectively. See Note 3,Variable Interest Entities.
|[1]                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        | Our consolidated assets as of September 30, 2020 and December 31, 2019 include total assets of variable interest entities of $222.0 million and $215.0 million, respectively, which cannot be used by us to settle the obligations of other entities. Our consolidated liabilities as of September 30, 2020 and December 31, 2019 include total liabilities of the variable interest entities of $44.6 million and $41.1 million, respectively. See Note 3,Variable Interest Entities.

X- DefinitionSum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.
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