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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Income tax expense (benefit) | $ 2.4 | $ (43.9) | $ 11.2 | $ (40.6) |
Effective income tax rate, continuing operations | 13.00% | 17.10% | 17.00% | 5.40% |
Unrecognized tax benefit liability, including penalties and accrued interest | $ 22.5 |  | $ 22.5 |  | $ 22.2
UNITED STATES |  |  |  |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount |  | $ 36.0 |  |  |
Settlement with Taxing Authority [Member] |  |  |  |  |
Other Tax Expense (Benefit) |  | (6.8) |  |  |
CARES Act [Member] |  |  |  |  |
Other Tax Expense (Benefit) |  | $ (7.0) |  | $ (7.5) |

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