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Summary of Significant Accounting Policies - Net Operating Revenues & Accounts Receivable (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating revenues | $ 1,184.4 | $ 1,161.6 | $ 1,135.0 | $ 1,124.0 | $ 1,096.0 | $ 1,067.6 | $ 1,067.7 | $ 1,046.0 | $ 4,605.0 | $ 4,277.3 | $ 3,913.9
Inpatient Rehabilitation |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating revenues |  |  |  |  |  |  |  |  | 3,513.0 | 3,346.2 | 3,141.3
Home Health and Hospice |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating revenues |  |  |  |  |  |  |  |  | 1,092.0 | 931.1 | 772.6
Payor Source | Revenue from Contract with Customer Benchmark |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating revenues |  |  |  |  |  |  |  |  | 4,605.0 | 4,277.3 | 3,913.9
Payor Source | Revenue from Contract with Customer Benchmark | Inpatient Rehabilitation |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating revenues |  |  |  |  |  |  |  |  | 3,513.0 | 3,346.2 | 3,141.3
Payor Source | Revenue from Contract with Customer Benchmark | Home Health and Hospice |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating revenues |  |  |  |  |  |  |  |  | 1,092.0 | 931.1 | 772.6
Payor Source | Revenue from Contract with Customer Benchmark | Medicare | Third-Party Payor |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating revenues |  |  |  |  |  |  |  |  | 3,457.3 | 3,246.2 | 2,976.5
Payor Source | Revenue from Contract with Customer Benchmark | Medicare | Third-Party Payor | Inpatient Rehabilitation |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating revenues |  |  |  |  |  |  |  |  | 2,537.3 | 2,451.7 | 2,313.6
Payor Source | Revenue from Contract with Customer Benchmark | Medicare | Third-Party Payor | Home Health and Hospice |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating revenues |  |  |  |  |  |  |  |  | 920.0 | 794.5 | 662.9
Payor Source | Revenue from Contract with Customer Benchmark | Medicare Advantage | Third-Party Payor |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating revenues |  |  |  |  |  |  |  |  | 487.4 | 395.1 | 335.8
Payor Source | Revenue from Contract with Customer Benchmark | Medicare Advantage | Third-Party Payor | Inpatient Rehabilitation |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating revenues |  |  |  |  |  |  |  |  | 375.5 | 306.5 | 261.0
Payor Source | Revenue from Contract with Customer Benchmark | Medicare Advantage | Third-Party Payor | Home Health and Hospice |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating revenues |  |  |  |  |  |  |  |  | 111.9 | 88.6 | 74.8
Payor Source | Revenue from Contract with Customer Benchmark | Managed Care | Third-Party Payor |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating revenues |  |  |  |  |  |  |  |  | 381.8 | 376.5 | 364.7
Payor Source | Revenue from Contract with Customer Benchmark | Managed Care | Third-Party Payor | Inpatient Rehabilitation |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating revenues |  |  |  |  |  |  |  |  | 342.7 | 343.3 | 335.6
Payor Source | Revenue from Contract with Customer Benchmark | Managed Care | Third-Party Payor | Home Health and Hospice |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating revenues |  |  |  |  |  |  |  |  | 39.1 | 33.2 | 29.1
Payor Source | Revenue from Contract with Customer Benchmark | Medicaid | Third-Party Payor |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating revenues |  |  |  |  |  |  |  |  | 128.7 | 112.9 | 97.5
Payor Source | Revenue from Contract with Customer Benchmark | Medicaid | Third-Party Payor | Inpatient Rehabilitation |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating revenues |  |  |  |  |  |  |  |  | 110.3 | 101.3 | 93.2
Payor Source | Revenue from Contract with Customer Benchmark | Medicaid | Third-Party Payor | Home Health and Hospice |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating revenues |  |  |  |  |  |  |  |  | 18.4 | 11.6 | 4.3
Payor Source | Revenue from Contract with Customer Benchmark | Other Third-party Payors | Third-Party Payor |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating revenues |  |  |  |  |  |  |  |  | 43.4 | 49.0 | 49.9
Payor Source | Revenue from Contract with Customer Benchmark | Other Third-party Payors | Third-Party Payor | Inpatient Rehabilitation |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating revenues |  |  |  |  |  |  |  |  | 43.4 | 49.0 | 49.9
Payor Source | Revenue from Contract with Customer Benchmark | Other Third-party Payors | Third-Party Payor | Home Health and Hospice |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating revenues |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Payor Source | Revenue from Contract with Customer Benchmark | Workers' Compensation | Third-Party Payor |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating revenues |  |  |  |  |  |  |  |  | 30.2 | 28.9 | 27.6
Payor Source | Revenue from Contract with Customer Benchmark | Workers' Compensation | Third-Party Payor | Inpatient Rehabilitation |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating revenues |  |  |  |  |  |  |  |  | 29.2 | 27.4 | 27.5
Payor Source | Revenue from Contract with Customer Benchmark | Workers' Compensation | Third-Party Payor | Home Health and Hospice |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating revenues |  |  |  |  |  |  |  |  | 1.0 | 1.5 | 0.1
Payor Source | Revenue from Contract with Customer Benchmark | Patients | Self-Pay |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating revenues |  |  |  |  |  |  |  |  | 23.9 | 19.5 | 19.1
Payor Source | Revenue from Contract with Customer Benchmark | Patients | Self-Pay | Inpatient Rehabilitation |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating revenues |  |  |  |  |  |  |  |  | 23.3 | 18.7 | 18.4
Payor Source | Revenue from Contract with Customer Benchmark | Patients | Self-Pay | Home Health and Hospice |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating revenues |  |  |  |  |  |  |  |  | 0.6 | 0.8 | 0.7
Payor Source | Revenue from Contract with Customer Benchmark | Other Income Source |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating revenues |  |  |  |  |  |  |  |  | 52.3 | 49.2 | 42.8
Payor Source | Revenue from Contract with Customer Benchmark | Other Income Source | Inpatient Rehabilitation |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating revenues |  |  |  |  |  |  |  |  | 51.3 | 48.3 | 42.1
Payor Source | Revenue from Contract with Customer Benchmark | Other Income Source | Home Health and Hospice |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating revenues |  |  |  |  |  |  |  |  | $ 1.0 | $ 0.9 | $ 0.7
Payor Source | Accounts Receivable |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating revenues by payor source (percent) |  |  |  |  |  |  |  |  | 100.00% | 100.00% |
Payor Source | Accounts Receivable | Medicare | Third-Party Payor |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating revenues by payor source (percent) |  |  |  |  |  |  |  |  | 72.10% | 73.20% |
Payor Source | Accounts Receivable | Managed Care, Medicare Advantage and Other Discount Plans | Third-Party Payor |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating revenues by payor source (percent) |  |  |  |  |  |  |  |  | 20.10% | 19.30% |
Payor Source | Accounts Receivable | Medicaid | Third-Party Payor |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating revenues by payor source (percent) |  |  |  |  |  |  |  |  | 3.10% | 2.80% |
Payor Source | Accounts Receivable | Other Third-party Payors | Third-Party Payor |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating revenues by payor source (percent) |  |  |  |  |  |  |  |  | 2.60% | 2.70% |
Payor Source | Accounts Receivable | Workers' Compensation | Third-Party Payor |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating revenues by payor source (percent) |  |  |  |  |  |  |  |  | 1.20% | 1.10% |
Payor Source | Accounts Receivable | Patients | Self-Pay |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating revenues by payor source (percent) |  |  |  |  |  |  |  |  | 0.90% | 0.90% |

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