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Income Taxes, Provision and Effective tax rate (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Income Taxes |  |
Provision for income taxes | $ (46.0) | $ (79.6)
Effective tax rate (as a percent) | 15.90% | 22.80%
Discrete income tax benefit, tax on foreign income | $ 19.9 |
Discrete income tax benefit, tax on foreign income | (6.90%) |
Excess tax benefit from option exercises | $ 5.0 | $ 6.8
Excess tax benefit, impact on effective tax rate (in basis points) | (1.70%) | (1.90%)

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