Shareholders' Equity - Treasury Stock (Details) - USD ($) $ / shares in Units, $ in Millions	6 Months Ended		50 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	May 02, 2012
Equity [Abstract]
Number of shares authorized to be repurchased (in shares)				5,000,000
Number shares repurchased (in shares)	0		3,000,000
Payments for repurchase of common stock	$ 0.2	$ 1.7	$ 13.3
Remaining number of shares authorized to be repurchased (in shares)	2,000,000		2,000,000
Average price per share of treasury stock acquired and held (in dollars per share)			$ 3.87
Movement in Treasury Stock [Roll Forward]
Beginning balance (in shares)	7,159,474
Purchases (in shares)	0		3,000,000
Exercise of stock options (in shares)	(7,222)
Restricted stock grants (in shares)	0
Forfeitures and other (in shares)	127,879
Ending balance (in shares)	7,280,131		7,280,131