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Income Taxes (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Income tax expense | $ 11.5 | $ 5.7 | $ 31.4 | $ 15.6 |
Effective income tax rate, continuing operations | 15.20% | 6.20% | 9.30% | 6.30% |
Unrecognized tax benefit liability, including penalties and accrued interest | $ 36.3 |  | $ 36.3 |  | $ 55.2
Foreign Tax Authority [Member] |  |  |  |  |
Change in Liability for Unrecognized Tax Benefits and Related Interest and Penalties |  |  | $ 20.0 |  |

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