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Contingencies and Other Commitments - Textual (Details) $ in Millions |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
May 18, 2016 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Feb. 28, 2015 patient | Apr. 24, 2014 facilities | Aug. 12, 2013 facilities | Mar. 04, 2013 facilities patient
Other Commitments [Abstract] |  |  |  |  |  |  |
2018 |  | $ 35.6 |  |  |  |  |
2019 |  | 20.5 |  |  |  |  |
2020 |  | 16.9 |  |  |  |  |
2021 |  | 8.8 |  |  |  |  |
2022 |  | 1.7 |  |  |  |  |
Thereafter |  | 2.0 |  |  |  |  |
HHS-OIG Investigation [Member] |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Number of additional patient medical records requested | patient |  |  |  | 70 |  |  |
Pending Litigation [Member] | Honts lawsuit [Member] |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Number of hospitals involved in lawsuit | facilities |  |  |  |  |  | 1 |
Verdict returned in favor of plaintiff | $ 20.0 |  |  |  |  |  |
Additional net charge recorded |  |  | $ 5.7 |  |  |  |
Liability recorded |  | 20.2 |  |  |  |  |
Receivable recorded for portion of liability expected to be covered by excess insurance coverages |  | 15.5 |  |  |  |  |
Maximum claim covered through captive insurance subsidiary |  | $ 6.0 |  |  |  |  |
Pending Litigation [Member] | HHS-OIG Investigation [Member] |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Number of hospitals that received subpoenas | facilities |  |  |  |  | 7 |  | 4
Number of patient medical records requested for each hospital in subpoenas | patient |  |  |  |  |  |  | 100
Number of hospitals that received supplemental subpoenas | facilities |  |  |  |  | 2 |  |
Compliance threshold under Health Care Act (percent) |  | 60.00% |  |  |  |  |

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