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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2020 | Dec. 31, 2019
Income Tax Disclosure [Abstract] |  |  |
Unrecognized income tax benefits that would affect effective tax rate |  | $ 248.0 | $ 210.7
Unrecognized tax benefits |  | 55.0 | 44.9
Accrued or deferred taxes relating to uncertain income tax positions |  | 99.0 | 51.0
Accrued interest and penalties relating to unrecognized tax benefits |  | $ 37.5 | $ 28.4
Other Noncash Income Tax Expense | $ 53.7 |  |

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