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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