Income Taxes - Narrative (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Effective income tax rate (percent)	35.20%	38.30%
Gross unrecognized tax benefit	$ 4.2		$ 3.9
Expected change in unrecognized tax benefits	1.3
Accrued interest on income taxes	5.3		4.9
Accrued penalties on income taxes, less than	$ 0.1		$ 0.1