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Segment Reporting - Revenues of Operating Segments by Service Line (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating revenues | $ 1,214.4 | $ 1,173.9 | $ 1,074.1 | $ 1,182.0 | $ 1,184.4 | $ 1,161.6 | $ 1,135.0 | $ 1,124.0 | $ 4,644.4 | $ 4,605.0 | $ 4,277.3
Inpatient Rehabilitation |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating revenues |  |  |  |  |  |  |  |  | 3,566.2 | 3,513.0 | 3,346.2
Inpatient Rehabilitation | Inpatient |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating revenues |  |  |  |  |  |  |  |  | 3,496.1 | 3,423.5 | 3,247.9
Inpatient Rehabilitation | Outpatient and other |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating revenues |  |  |  |  |  |  |  |  | 70.1 | 89.5 | 98.3
Home Health and Hospice |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating revenues |  |  |  |  |  |  |  |  | 1,078.2 | 1,092.0 | 931.1
Home Health and Hospice | Home health |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating revenues |  |  |  |  |  |  |  |  | 877.6 | 918.0 | 814.6
Home Health and Hospice | Hospice |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating revenues |  |  |  |  |  |  |  |  | $ 200.6 | $ 174.0 | $ 116.5

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