Share-Based Compensation - Option Activity (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Options exercised (in shares)			0	3,333
Exercised (weighted averaged exercise price) (in dollars per share)			$ 0.00	$ 6.75
Options vested in period (in shares)			66,668
Aggregate fair value of options vested in period			$ 0.3
Unrecognized compensation cost related to stock options	$ 0.2		$ 0.2
Weighted average period for recognition of compensation cost			1 year 11 months 4 days
Share-based compensation expense	$ 0.1	$ 0.2	$ 0.5	$ 0.4