Income Taxes - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Effective income tax rate (percent)	23.10%	24.80%
Gross unrecognized tax benefit	$ 5.2		$ 5.2
Expected change in unrecognized tax benefits	0.9
Accrued interest on income taxes	1.3		1.1
Accrued penalties on income taxes, less than	$ 0.1		$ 0.1