Stockholders' Equity and Earnings Per Common Share (Tables)

3 Months Ended

Mar. 31, 2012

Earnings Per Share, Basic and Diluted [Abstract]

Net Income Per Common Share

Net income per common share is determined as follows:

	Three Months Ended March 31
	2012		2011
	(in millions of dollars, except share data)
Numerator
Net Income	$	213.9	$	223.6
Denominator (000s)
Weighted Average Common Shares - Basic	290,429.5		312,742.3
Dilution for Assumed Exercises of Stock Options and Nonvested Stock Awards	854.5		1,590.0
Weighted Average Common Shares - Assuming Dilution	291,284.0		314,332.3
Net Income Per Common Share
Basic	$	0.74	$	0.72
Assuming Dilution	$	0.73	$	0.71