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Income Taxes Primary Impact on Provision for Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | Dec. 31, 2019 | Jun. 30, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Tax Disclosure [Abstract] |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Percent |  |  |  | 2.20% | 23.30% | 23.80%
Previously unrecognized tax benefits | $ 136.2 |  | $ 13.9 | $ (136.2) | $ 0.0 | $ 0.0
Reversal of valuation allowance |  | $ 25.3 |  |  |  |

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