Stock-Based Compensation (Stock Option and SSARs Activity) (Details) - Stock Options and SSARs $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($) $ / shares shares
Number Outstanding [Roll Forward]
Outstanding at December 31, 2014 | shares	4,973,386
Granted | shares	1,419,510
Exercised | shares	(456,341)
Lapsed | shares	(353,024)
Outstanding at December 31, 2015 | shares	5,583,531
Weighted Average Exercise Price [Roll Forward]
Outstanding at December 31, 2014 | $ / shares	$ 7.02
Granted | $ / shares	7.52
Exercised | $ / shares	2.01
Lapsed | $ / shares	12.60
Outstanding at December 31, 2015 | $ / shares	$ 7.20
Outstanding at December 31, 2015, Weighted Average Remaining Contractual Term	4 years 4 months 9 days
Outstanding at December 31, 2015, Aggregate Intrinsic Value | $	$ 4.3
Options/SSARs vested or expected to vest, Number Outstanding | shares	5,464,418
Options/SSARs vested or expected to vest, Weighted Average Exercise Price | $ / shares	$ 7.20
Options/SSARs vested or expected to vest, Weighted Average Remaining Contractual Term	4 years 3 months 27 days
Options/SSARs vested or expected to vest, Aggregate Intrinsic Value | $	$ 4.3
Exercisable shares at December 31, 2015 | shares	2,794,497
Exercisable shares at December 31, 2015, Weighted Average Exercise Price | $ / shares	$ 7.37
Exercisable shares at December 31, 2015, Weighted Average Contractual Term	3 years 2 months
Exercisable shares at December 31, 2015, Aggregate Intrinsic Value | $	$ 3.3