Employee Benefit Plans - Stock Purchase Plan (Details) - Employee Stock [Member] - Employee Stock Purchase Plan [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Employee benefit plans [Line Items]
Proceeds from purchase of shares by employees	$ 0.8	$ 0.9	$ 0.9
Number of shares issued by the Company	38,565	43,273	57,980
Recorded in share-based compensation, net of deferral	$ 0.2	$ 0.2	$ 0.3