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Basis of Presentation - Table 1 (Details) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 USD ($) state | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) state | Jun. 30, 2017 USD ($) | Dec. 31, 2017
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net operating revenues | $ 1,067.7 | $ 966.4 | $ 2,113.7 | $ 1,923.5 |
Number of states in which entity operates | state | 36 |  | 36 |  |
Inpatient Rehabilitation Segment [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net operating revenues | $ 834.6 | 777.6 | $ 1,674.9 | 1,555.4 |
Number of states in which entity operates | state | 31 |  | 31 |  |
Home Health and Hospice Segment [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net operating revenues | $ 233.1 | 188.8 | $ 438.8 | 368.1 |
Number of states in which entity operates | state | 30 |  | 30 |  |
Net operating revenues [Member] | Payor Source [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net operating revenues | $ 1,067.7 | 966.4 | $ 2,113.7 | 1,923.5 |
Net operating revenues [Member] | Other income [Member] | Payor Source [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net operating revenues | 11.7 | 10.1 | 21.7 | 19.9 |
Net operating revenues [Member] | Inpatient Rehabilitation Segment [Member] | Payor Source [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net operating revenues | 834.6 | 777.6 | 1,674.9 | 1,555.4 |
Net operating revenues [Member] | Inpatient Rehabilitation Segment [Member] | Other income [Member] | Payor Source [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net operating revenues | 11.5 | 9.9 | 21.3 | 19.5 |
Net operating revenues [Member] | Home Health and Hospice Segment [Member] | Payor Source [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net operating revenues | 233.1 | 188.8 | 438.8 | 368.1 |
Net operating revenues [Member] | Home Health and Hospice Segment [Member] | Other income [Member] | Payor Source [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net operating revenues | 0.2 | 0.2 | 0.4 | 0.4 |
Net operating revenues [Member] | Third-Party Payor [Member] | Medicare [Member] | Payor Source [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net operating revenues | 806.3 | 730.7 | 1,607.7 | 1,456.7 |
Net operating revenues [Member] | Third-Party Payor [Member] | Medicare Advantage [Member] | Payor Source [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net operating revenues | 100.5 | 86.2 | 193.0 | 169.2 |
Net operating revenues [Member] | Third-Party Payor [Member] | Managed Care [Member] | Payor Source [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net operating revenues | 95.3 | 91.9 | 187.9 | 183.9 |
Net operating revenues [Member] | Third-Party Payor [Member] | Medicaid [Member] | Payor Source [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net operating revenues | 29.5 | 24.3 | 54.7 | 47.1 |
Net operating revenues [Member] | Third-Party Payor [Member] | Other third-party payors [Member] | Payor Source [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net operating revenues | 12.7 | 12.5 | 24.7 | 23.9 |
Net operating revenues [Member] | Third-Party Payor [Member] | Workers' compensation [Member] | Payor Source [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net operating revenues | 7.0 | 6.5 | 14.5 | 14.0 |
Net operating revenues [Member] | Third-Party Payor [Member] | Inpatient Rehabilitation Segment [Member] | Medicare [Member] | Payor Source [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net operating revenues | 607.1 | 569.2 | 1,231.6 | 1,142.9 |
Net operating revenues [Member] | Third-Party Payor [Member] | Inpatient Rehabilitation Segment [Member] | Medicare Advantage [Member] | Payor Source [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net operating revenues | 78.7 | 67.1 | 151.2 | 131.9 |
Net operating revenues [Member] | Third-Party Payor [Member] | Inpatient Rehabilitation Segment [Member] | Managed Care [Member] | Payor Source [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net operating revenues | 86.6 | 85.3 | 171.6 | 170.2 |
Net operating revenues [Member] | Third-Party Payor [Member] | Inpatient Rehabilitation Segment [Member] | Medicaid [Member] | Payor Source [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net operating revenues | 26.8 | 23.1 | 51.5 | 44.7 |
Net operating revenues [Member] | Third-Party Payor [Member] | Inpatient Rehabilitation Segment [Member] | Other third-party payors [Member] | Payor Source [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net operating revenues | 12.7 | 12.5 | 24.7 | 23.9 |
Net operating revenues [Member] | Third-Party Payor [Member] | Inpatient Rehabilitation Segment [Member] | Workers' compensation [Member] | Payor Source [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net operating revenues | 6.8 | 6.5 | 14.2 | 13.9 |
Net operating revenues [Member] | Third-Party Payor [Member] | Home Health and Hospice Segment [Member] | Medicare [Member] | Payor Source [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net operating revenues | 199.2 | 161.5 | 376.1 | 313.8 |
Net operating revenues [Member] | Third-Party Payor [Member] | Home Health and Hospice Segment [Member] | Medicare Advantage [Member] | Payor Source [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net operating revenues | 21.8 | 19.1 | 41.8 | 37.3 |
Net operating revenues [Member] | Third-Party Payor [Member] | Home Health and Hospice Segment [Member] | Managed Care [Member] | Payor Source [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net operating revenues | 8.7 | 6.6 | 16.3 | 13.7 |
Net operating revenues [Member] | Third-Party Payor [Member] | Home Health and Hospice Segment [Member] | Medicaid [Member] | Payor Source [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net operating revenues | 2.7 | 1.2 | 3.2 | 2.4 |
Net operating revenues [Member] | Third-Party Payor [Member] | Home Health and Hospice Segment [Member] | Other third-party payors [Member] | Payor Source [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net operating revenues | 0.0 | 0.0 | 0.0 | 0.0 |
Net operating revenues [Member] | Third-Party Payor [Member] | Home Health and Hospice Segment [Member] | Workers' compensation [Member] | Payor Source [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net operating revenues | 0.2 | 0.0 | 0.3 | 0.1 |
Net operating revenues [Member] | Self-Pay [Member] | Patients [Member] | Payor Source [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net operating revenues | 4.7 | 4.2 | 9.5 | 8.8 |
Net operating revenues [Member] | Self-Pay [Member] | Inpatient Rehabilitation Segment [Member] | Patients [Member] | Payor Source [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net operating revenues | 4.4 | 4.0 | 8.8 | 8.4 |
Net operating revenues [Member] | Self-Pay [Member] | Home Health and Hospice Segment [Member] | Patients [Member] | Payor Source [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net operating revenues | $ 0.3 | $ 0.2 | $ 0.7 | $ 0.4 |
Accounts receivable [Member] | Payor Source [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net operating revenues by payor source (percent) |  |  | 100.00% |  | 100.00%
Accounts receivable [Member] | Third-Party Payor [Member] | Medicare [Member] | Payor Source [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net operating revenues by payor source (percent) |  |  | 72.90% |  | 75.10%
Accounts receivable [Member] | Third-Party Payor [Member] | Managed Care, Medicare Advantage and Other Discount Plans [Member] | Payor Source [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net operating revenues by payor source (percent) |  |  | 19.20% |  | 17.40%
Accounts receivable [Member] | Third-Party Payor [Member] | Medicaid [Member] | Payor Source [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net operating revenues by payor source (percent) |  |  | 2.90% |  | 2.40%
Accounts receivable [Member] | Third-Party Payor [Member] | Other third-party payors [Member] | Payor Source [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net operating revenues by payor source (percent) |  |  | 2.90% |  | 2.90%
Accounts receivable [Member] | Third-Party Payor [Member] | Workers' compensation [Member] | Payor Source [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net operating revenues by payor source (percent) |  |  | 1.20% |  | 1.30%
Accounts receivable [Member] | Self-Pay [Member] | Patients [Member] | Payor Source [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net operating revenues by payor source (percent) |  |  | 0.90% |  | 0.90%

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