Stockholders' Equity and Earnings Per Common Share (Tables)

6 Months Ended

Jun. 30, 2021

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 June 30				Six Months Ended June 30
	2021		2020		2021		2020
	(in millions of dollars, except share data)
Numerator
Net Income	$	182.9	$	265.5	$	335.9	$	426.5
Denominator (000s)
Weighted Average Common Shares - Basic	204,504.5		203,624.3		204,323.1		203,466.9
Dilution for Assumed Exercises of Stock Options and Nonvested Stock Awards	769.3		46.8		686.7		48.3
Weighted Average Common Shares - Assuming Dilution	205,273.8		203,671.1		205,009.8		203,515.2
Net Income Per Common Share
Basic	$	0.89	$	1.30	$	1.64	$	2.10
Assuming Dilution	$	0.89	$	1.30	$	1.64	$	2.10