Stockholders' Equity and Earnings Per Common Share (Tables)

12 Months Ended

Dec. 31, 2012

Earnings Per Share, Basic and Diluted [Abstract]

Share Repurchase Table [Table Text Block]

Common stock repurchases were classified as follows in our consolidated statements of stockholders' equity:

	Year Ended December 31
	2012			2011			2010
	Shares	Cost (1)		Shares	Cost (1)		Shares	Cost (1)
	(in millions)
Treasury Stock	23.6	$	500.6	17.7	$	419.9	16.4	$	356.0
Retirement of Common Shares (2)	—	—		7.7	200.0		—	—
Total	23.6	$	500.6	25.4	619.9		16.4	356.0

Net Income Per Common Share

Net income per common share is determined as follows:

	Year Ended December 31
	2012		2011		2010
	(in millions of dollars, except share data)
Numerator
Net Income	$	894.4	$	284.2	$	878.7
Denominator (000s)
Weighted Average Common Shares - Basic	281,355.9		302,399.8		325,839.0
Dilution for Assumed Exercises of Stock Options and Nonvested Stock Awards	400.9		1,171.2		1,382.1
Weighted Average Common Shares - Assuming Dilution	281,756.8		303,571.0		327,221.1
Net Income Per Common Share
Basic	$	3.18	$	0.94	$	2.70
Assuming Dilution	$	3.17	$	0.94	$	2.69