Income Taxes - Narrative (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Feb. 29, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Uncertain tax benefits that, if recognized, would affect effective tax rate		$ 2.5	$ 3.1
Recognized interest and penalties expense (benefit) related to unrecognized tax benefits		0.1	0.4	$ 0.3
Accrued interest and penalties		$ 0.9	$ 1.0
Proceeds from refund of overpaid federal tax	$ 120.0