Share-Based Compensation Plans (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended									34 Months Ended		12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 Stock Options [Member]	Dec. 31, 2011 Stock Options [Member]	Dec. 31, 2010 Stock Options [Member]	Dec. 31, 2012 Restricted Stock Units [Member]	Dec. 31, 2012 Restricted Stock Units and Performance Restricted Stock Units [Member]	Dec. 31, 2012 Performance Restricted Stock Units [Member]	Dec. 31, 2014 Performance Restricted Stock Units [Member]	Dec. 31, 2012 2010 Plan [Member]	Dec. 31, 2012 Restricted Stock Units - Treasury Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Plan Modification, Incremental Compensation Cost										$ 0.9
Granted, weighted-average grant-date fair value							$ 18.13		$ 19.45			$ 21.69
Maximum award, number of shares											32,000,000
Multiplier for grant award	2.33
Vesting period, years				3 years			3 years		3 years			5 years
Allocated Share-based Compensation Expense	41.1	36.6	57.6									1.4
Common Stock, Dividends, Per Share, Declared	$ 0.23	$ 0.23	$ 0.22
Contractual term, years				10 years
Weighted-average grant-date fair value per share				$ 3.55	$ 6.51	$ 7.91
Fair value vested during period							22.8
Unrecognized compensation cost				3.8				43.7				2.9
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition				1 year 3 months 18 days				1 year 9 months 18 days
Granted, restricted stock and units							1,792,000		1,998,000			200,000
Incremental compensation cost associated with modification of stock award recognized									$ 0.3