Share-Based Compensation Plans - Options Activity (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based compensation plans [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	3,700,000
Share-based Compensation Plans Optoins Outstanding [Roll Forward]
Beginning Balances - shares	1,474,900
Options Exercised - shares	(18,300)
Cancelled	(611,800)
Ending Balance - shares	844,800
Share-based Compensation Plans Optoins Outstanding Exercise Price [Abstract]
Beginning Balances - Exercise Price	$ 29.58
Options granted - Exercise Price	$ 0
Options Exercised - Exercise Price	$ 20.34
Cancelled	$ 34.96
Ending Balance - Exercise Price	$ 25.88
Outstanding Options - Remaining Term Years	2 years 6 months
Exercisable Options - Shares	726,700	1,200,000	2,000,000
Exercisable Options - Remaining Term Years	2 years 4 months 24 days
Options Expected to Vest in Future Periods - Remaining Term Years	3 years 6 months
Outstanding Options - Average Intrinsic Value	$ 1.2
Exercisable Options - Average Intrinsic Value	1.0
Options Expected to Vest in Future Periods - Average Intrinsic Value	$ 0.2
Options Expected to Vest in Future Periods - Shares	117,600
Options Expected to Vest in Future Periods - Exercise Price	$ 22.46