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Income Taxes, Provision and Effective tax rate (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Income Taxes |  |  |  |
Provision for income taxes | $ (78.1) | $ (68.0) | $ (182.2) | $ (114.0)
Effective tax rate | 17.50% | 20.70% | 20.60% | 18.50%
Discrete income tax benefit, tax on foreign income |  |  |  | $ 19.9
Discrete income tax benefit, impact on effective tax rate |  |  |  | (3.20%)
Tax settlement, amount | $ (14.9) |  | $ (14.9) |
Tax settlement, effective tax rate | (3.30%) |  | (1.70%) |
Excess tax benefit from option exercises | $ 19.3 | $ 12.4 | $ 22.0 | $ 17.4
Excess tax benefit, impact on effective tax rate | (4.30%) | (3.80%) | (2.50%) | (2.80%)
Impact of acquisition-related expenses on the effective tax rate | 0.60% |  | 0.30% |

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