Stockholders' Equity and Earnings Per Common Share (Tables)

9 Months Ended

Sep. 30, 2020

Stockholders' Equity and Earnings Per Common Share [Abstract]

Schedule of Basic and Diluted Earnings Per Share

Net income per common share is determined as follows:

	Three Months Ended September 30				Nine Months Ended September 30
	2020		2019		2020		2019
	(in millions of dollars, except share data)
Numerator
Net Income	$	231.1	$	242.0	$	657.6	$	804.1
Denominator (000s)
Weighted Average Common Shares - Basic	203,761.3		208,097.8		203,564.7		211,131.5
Dilution for Assumed Exercises of Stock Options and Nonvested Stock Awards	117.8		18.2		71.4		65.7
Weighted Average Common Shares - Assuming Dilution	203,879.1		208,116.0		203,636.1		211,197.2
Net Income Per Common Share
Basic	$	1.13	$	1.16	$	3.23	$	3.81
Assuming Dilution	$	1.13	$	1.16	$	3.23	$	3.81