Stockholders' Equity and Earnings Per Common Share (Tables)

6 Months Ended

Jun. 30, 2013

Jun. 30, 2012

Earnings Per Share, Basic and Diluted [Abstract]

Net Income Per Common Share (Detail)

Net income per common share is determined as follows:

	Three Months Ended June 30				Six Months Ended June 30
	2013		2012		2013		2012
	(in millions of dollars, except share data)
Numerator
Net Income	$	218.6	$	216.4	$	431.2	$	430.3
Denominator (000s)
Weighted Average Common Shares - Basic	265,560.4		283,316.6		267,452.0		286,874.5
Dilution for Assumed Exercises of Stock Options and Nonvested Stock Awards	1,175.9		424.0		1,084.6		639.3
Weighted Average Common Shares - Assuming Dilution	266,736.3		283,740.6		268,536.6		287,513.8
Net Income Per Common Share
Basic	$	0.82	$	0.76	$	1.61	$	1.50
Assuming Dilution	$	0.82	$	0.76	$	1.61	$	1.50

Share Repurchase Table [Table Text Block]

Common stock repurchases, which are classified as treasury stock and accounted for using the cost method, were as follows:

	Three Months Ended June 30				Six Months Ended June 30
	2013		2012		2013		2012
	(in millions)
Shares Repurchased	3.6		6.0		7.3		13.5
Cost of Shares Repurchased (1)	$	98.4	$	125.1	$	193.5	$	300.3