Income Taxes - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Tax Disclosure [Abstract]
Income tax expense	$ 7.5	$ 5.7	$ 17.4	$ 16.2
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount			$ 0.6
Effective tax rate	37.50%	43.20%	35.80%	37.20%