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Income Taxes (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014
Income tax expense | $ 14.4 | $ 7.5 | $ 36.5 | $ 25.8 |
Effective income tax rate, continuing operations | 19.30% | 14.60% | 17.50% | 16.60% |
Unrecognized tax benefit liability, including penalties and accrued interest | $ 62.9 |  | $ 62.9 |  | $ 59.5

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