Net Income Per Common Share (Schedule of Average Shares Excluded From Diluted Net Income Per Common Share Computation) (Details) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Stock Options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Average outstanding securities	10.8	16.0	17.1
Stock Options | Minimum
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Exercise price	34.78	29.81	25.34
Stock Options | Maximum
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Exercise price	61.94	64.50	64.50
Warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Average outstanding securities	0	0.3	6.0
Exercise price	0.00	30.36
Warrants | Minimum
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Exercise price			29.40
Warrants | Maximum
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Exercise price			30.36