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Income Taxes, Provision and Effective tax rate (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Income Taxes |  |  |  |
Provision for income taxes | $ (68.0) | $ (78.7) | $ (114.0) | $ (158.3)
Effective tax rate (as a percent) | 20.70% | 21.30% | 18.50% | 22.00%
Discrete income tax benefit, tax on foreign income |  |  | $ 19.9 |
Discrete income tax benefit, impact on effective tax rate (in basis points) |  |  | (3.20%) |
Excess tax benefit from option exercises | $ 12.4 | $ 12.9 | $ 17.4 | $ 19.7
Excess tax benefit, impact on effective tax rate (in basis points) | (3.80%) | (3.50%) | (2.80%) | (2.70%)

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