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Income Taxes (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Income tax expense | $ 17.9 | $ 7.5 |
Effective income tax rate, continuing operations | 16.70% | 8.70% |
Unrecognized tax benefit liability, including penalties and accrued interest | $ 55.4 |  | $ 55.2

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