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Income Taxes - Effective Income Tax Rate Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Valuation allowance, deferred tax asset, increase (decrease), amount |  | $ 14.5 | $ 25.4 | $ 16.0
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities | $ 25.3 | 12.2 |  | 3.7
Income tax benefit of goodwill impairment loss |  |  |  | 85.0
United States |  |  |  |
Valuation allowance, deferred tax asset, increase (decrease), amount |  | 5.3 |  |
Foreign Tax Authority [Member] |  |  |  |
Valuation allowance, deferred tax asset, increase (decrease), amount |  |  | 12.8 | 3.1
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities |  |  |  | $ 20.0
Settlement with Taxing Authority [Member] |  |  |  |
Other Tax Expense (Benefit) |  | 6.8 |  |
Loss carryback related to the CARES Act [Member] |  |  |  |
Other Tax Expense (Benefit) |  | $ (14.4) |  |
Transition tax [Member] |  |  |  |
Other Tax Expense (Benefit) |  |  | $ 9.3 |

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