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Income Taxes, Provision and Effective tax rate (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Income Taxes |  |  |  |
Provision for income taxes | $ (120.5) | $ (99.3) | $ (302.8) | $ (213.3)
Effective tax rate | 22.20% | 22.10% | 21.20% | 20.00%
Discrete income tax benefit, tax on foreign income |  |  |  | $ 19.9
Discrete income tax benefit, impact on effective tax rate |  |  |  | (1.90%)
Tax settlement, amount |  |  | $ (14.9) |
Tax settlement, effective tax rate |  |  | (1.00%) |
Excess tax benefit from option exercises | $ 12.3 | $ 10.7 | $ 34.3 | $ 28.1
Excess tax benefit, impact on effective tax rate | (2.30%) | (2.40%) | (2.40%) | (2.60%)
Impact of acquisition-related expenses on the effective tax rate |  |  | 0.20% |

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