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Income Taxes - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Income Tax Disclosure [Abstract]        
Income tax expense $ 6.1 $ 4.8 $ 9.9 $ 10.5
Effective tax rate 34.70% 33.80% 34.60% 34.70%