Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Tax Disclosure [Abstract]
Income tax provision	$ 12.5	$ 11.9	$ 17.2	$ 15.2
Effective income tax rate			26.10%	33.50%