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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Dec. 31, 2021
Valuation Allowance [Line Items] |  |  |  |  |
Gross deferred federal, state and local tax expense (benefit) | $ 7.3 | $ 81.0 | $ 52.8 | $ 35.0 |
Increase (decrease) in valuation allowance | 6.7 | $ 71.8 | 50.7 | 26.5 |
Deferred federal, state and local tax benefit |  |  |  | 69.3 |
Valuation allowance | $ 418.7 |  | $ 418.7 |  | $ 368.0
Current Operating Loss |  |  |  |  |
Valuation Allowance [Line Items] |  |  |  |  |
Increase (decrease) in valuation allowance |  |  |  | 68.6 |
HCA Healthcare, Inc. | Health Care Services | Securities Purchase Agreement |  |  |  |  |
Valuation Allowance [Line Items] |  |  |  |  |
Gross deferred federal, state and local tax expense (benefit) |  |  |  | 104.3 |
Increase (decrease) in valuation allowance |  |  |  | $ 95.2 |

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