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Income Taxes, Provision and Effective tax rate (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Income Taxes |  |
Provision for income taxes | $ (104.1) | $ (46.0)
Effective tax rate | 23.90% | 15.90%
Discrete income tax benefit, tax on foreign income |  | $ 19.9
Discrete income tax benefit, impact on effective tax rate |  | (6.90%)
Excess tax benefit from option exercises | $ 2.6 | $ 5.0
Excess tax benefit, impact on effective tax rate | (0.60%) | (1.70%)

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