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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