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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2018 | Sep. 30, 2017
Income Tax Disclosure [Abstract] |  |  |
Effective income tax rate on continuing operations (as a percent) |  | 22.20% | 33.30%
Anticipated effective tax rate for beginning of year to date (as a percent) |  | 24.60% |
Discrete income tax expense (benefit) | $ 1.3 | $ (8.4) | $ 0.3
Decrease in unrecognized tax benefits |  | 4.4 |
Excess tax benefits related to employee stock compensation |  | $ 4.6 |

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