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Income Taxes (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Dec. 31, 2014
Income tax expense | $ 12.9 | $ 11.3 | $ 22.1 | $ 18.3 |
Effective income tax rate, continuing operations | 18.00% | 17.80% | 16.50% | 17.60% |
Discrete income tax benefit |  |  | $ 1.0 |  |
Unrecognized tax benefit liability, including penalties and accrued interest | $ 62.5 |  | $ 62.5 |  | $ 59.5

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