Income Taxes - Unrecognized Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Reconciliation of Unrecognized Tax Benefits [Roll Forward]
Uncertain tax position balance at beginning of year	$ 1.8	$ 1.8	$ 1.8
Increases related to current year tax positions	0.0	0.0	0.0
Decrease related to expiration of statute of limitations	(0.9)	0.0	0.0
Uncertain tax position balance at end of year	0.9	$ 1.8	$ 1.8
Decrease in unrecognized tax benefits that may be recognized in next fiscal year	$ 0.5