Stockholders' Equity and Earnings Per Common Share (Tables)

3 Months Ended

Mar. 31, 2013

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
	2013		2012
	(in millions of dollars, except share data)
Numerator
Net Income	$	212.6	$	213.9
Denominator (000s)
Weighted Average Common Shares - Basic	269,361.1		290,429.5
Dilution for Assumed Exercises of Stock Options and Nonvested Stock Awards	993.3		854.5
Weighted Average Common Shares - Assuming Dilution	270,354.4		291,284.0
Net Income Per Common Share
Basic	$	0.79	$	0.74
Assuming Dilution	$	0.79	$	0.73