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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Income tax benefit | $ (22.5) |  |  | $ (40.4) | $ (63.1) | $ (37.4) |
Effective income tax rate, continuing operations | (23.80%) |  |  | 24.60% | 9.60% | 55.70% |
Tax Adjustments, Settlements, and Unusual Provisions |  | $ 18.5 |  |  |  |  |
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities |  | 25.3 |  |  |  |  |
Unrecognized tax benefit liability, including penalties and accrued interest | $ 23.3 |  |  |  | $ 23.3 |  | $ 52.6
Settlement with Taxing Authority [Member] |  |  |  |  |  |  |
Other Tax Expense (Benefit) |  |  |  |  | (6.8) |  |
CARES Act [Member] |  |  |  |  |  |  |
Other Tax Expense (Benefit) |  |  | $ (7.5) |  | $ (7.0) |  |
Transition Tax [Member] |  |  |  |  |  |  |
Other Tax Expense (Benefit) |  |  |  |  |  | $ (9.3) |
UNITED STATES |  |  |  |  |  |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | $ (36.0) | $ 36.0 |  |  |  |  |

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