Share-Based Compensation (Summary of Stock Option Activity) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Options Outstanding
Outstanding at December 31, 2014	1,863,800
Granted	352,100	0	334,000
Exercised	(17,700)
Forfeited or Expired	(118,300)
Outstanding as of December 31, 2015	2,079,900	1,863,800
Exercisable at December 31, 2015	1,635,100
Options expected to vest in the next twelve months	210,000
Weighted Average Exercise Price
Outstanding at December 31, 2014	$ 33.12
Granted	19.65
Exercised	11.98
Forfeited or Expired	24.43
Outstanding as of December 31, 2015	31.51	$ 33.12
Exercisable at December 31, 2015	33.85
Options expected to vest in the next twelve months	$ 26.53
Outstanding, weighted average remaining contactual term, years	4 years 11 months 1 day	4 years 8 months
Exercisable at December 31, 2015, weighted average remaining contractual term, years	3 years 10 months 6 days
Options expected to vest in the next twelve months, weighted average remaining contractual term, years	8 years 6 months 6 days
Outstanding, aggregate intrinsic value	$ 0.0	$ 0.2
Exercisable at December 31, 2015, average intrinsic value	0.0
Options expected to vest in the next twelve months, aggregate intrinsic value	$ 0.0