Share-Based Compensation (Summary of Stock Option Activity) (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Options Outstanding
Outstanding at December 31, 2013	1,944,100
Granted	0
Exercised	(19,700)
Forfeited or Expired	(60,600)
Outstanding as of December 31, 2014	1,863,800	1,944,100
Exercisable at December 31, 2014	1,580,100
Options expected to vest in the next twelve months	186,000
Weighted Average Exercise Price
Outstanding at December 31, 2013	$ 33.18
Granted	$ 0.00
Exercised	$ 14.11
Forfeited or Expired	$ 41.26
Outstanding as of December 31, 2014	$ 33.12	$ 33.18
Exercisable at December 31, 2014	$ 32.89
Options expected to vest in the next twelve months	$ 33.94
Outstanding, weighted average remaining contactual term, years	4 years 8 months 1 day	6 years 1 month 0 days
Exercisable at December 31, 2014, weighted average remaining contractual term, years	4 years 1 month 6 days
Options expected to vest in the next twelve months, weighted average remaining contractual term, years	7 years 8 months 6 days
Outstanding, aggregate intrinsic value	$ 0.2	$ 7.0
Exercisable at December 31, 2014, average intrinsic value	0.2
Options expected to vest in the next twelve months, aggregate intrinsic value	$ 0