Stockholders' Equity and Earnings Per Common Share (Tables)

12 Months Ended

Dec. 31, 2022

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:

	Year Ended December 31
	2022		2021		2020
	(in millions of dollars, except share data)
Numerator
Net Income	$	1,314.2	$	824.2	$	793.0
Denominator (000s)
Weighted Average Common Shares - Basic	200,647.2		204,232.9		203,642.0
Dilution for Assumed Exercises of Stock Options and Nonvested Stock Awards	1,462.2		615.0		113.3
Weighted Average Common Shares - Assuming Dilution	202,109.4		204,847.9		203,755.3
Net Income Per Common Share
Basic	$	6.55	$	4.04	$	3.89
Assuming Dilution	$	6.50	$	4.02	$	3.89

Treasury Stock Transactions

Common stock repurchases, which are accounted for using the cost method and classified as treasury stock until otherwise retired, were as follows:

	Year Ended December 31
	2022		2021		2020
	(in millions)
Shares Repurchased	5.7		1.9		—
Cost of Shares Repurchased1	$	200.1	$	50.0	$	—

1 Includes commissions of $0.1 million for the year ended December 31, 2022.