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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