Stockholders' Equity and Earnings Per Common Share (Tables)

3 Months Ended

Mar. 31, 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 March 31
	2020		2019
	(in millions of dollars, except share data)
Numerator
Net Income	$	161.0	$	280.9
Denominator (000s)
Weighted Average Common Shares - Basic	203,306.0		214,297.1
Dilution for Assumed Exercises of Stock Options and Nonvested Stock Awards	49.7		132.6
Weighted Average Common Shares - Assuming Dilution	203,355.7		214,429.7
Net Income Per Common Share
Basic	$	0.79	$	1.31
Assuming Dilution	$	0.79	$	1.31