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Income Taxes, Provision and Effective tax rate (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Income Taxes |  |  |  |
Provision for income taxes | $ (91.8) | $ (100.0) | $ (250.0) | $ (280.8)
Effective tax rate (as a percent) | 24.50% | 23.80% | 22.90% | 24.30%
Excess tax benefit from option exercises | $ 1.6 | $ 7.0 | $ 21.3 | $ 14.1
Excess tax benefit, impact on effective tax rate (in basis points) | (0.40%) | (1.70%) | (1.90%) | (1.20%)
Tender Offers [Member] |  |  |  |
Income Taxes |  |  |  |
Early extinguishment of debt, impact on effective tax rate (in basis points) | 0.40% |  | 0.10% |

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