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Income Taxes (Textuals) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Income Taxes (Textual) [Abstract]      
Income tax provision $ 16.0 $ 14.0  
Effective tax rate 17.10% 20.40%  
Unrecognized tax benefits $ 131.0   $ 130.0
Interest accrued for unrecognized tax benefits $ 4.0