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Income Taxes - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Income Tax Disclosure [Abstract]    
Effective income tax rate 30.10% 27.20%
Federal statutory tax rate 21.00% 35.00%
Income Taxes Paid $ 9.1 $ 2.5