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Earnings Per Share (Tables)
9 Months Ended
Sep. 30, 2023
Earnings Per Share [Abstract]  
Schedule of Reconciliation of Basic and Diluted Earnings Per Share Computations
The following tables provide a reconciliation of basic and diluted earnings per share computations for the three and nine months ended September 30, 2023 and 2022:


 Three Months Ended
September 30,
Nine Months Ended
September 30,
(Millions of dollars, except share and per share amounts)2023202220232022
Earnings per common share:  
Net income per share - basic
Net income attributable to common stockholders$167.7 $219.5 $406.8 $555.2 
Weighted average common shares outstanding (in thousands)21,401 23,206 21,635 23,963 
Earnings per common share$7.83 $9.46 $18.80 $23.17 
Three Months Ended
March 31,
Nine Months Ended
September 30,
(Millions of dollars, except share and per share amounts)2023202220232022
Earnings per common share - assuming dilution:  
Net income per share - diluted
Net income attributable to common stockholders$167.7 $219.5 $406.8 $555.2 
Weighted average common shares outstanding (in thousands)21,401 23,206 21,635 23,963 
Common equivalent shares:  
Dilutive share-based awards389 444 385 435 
Weighted average common shares outstanding - assuming dilution
(in thousands)
21,790 23,650 22,020 24,398 
Earnings per common share assuming dilution$7.69 $9.28 $18.47 $22.76 
Schedule of Potentially Dilutive Shares Excluded from Earnings Per Share
We have excluded from the earnings-per-share calculation certain stock options and shares that are considered to be anti-dilutive under the treasury stock method and are reported in the table below.

Three Months Ended
September 30,
Nine Months Ended
September 30,
Potentially dilutive shares excluded from the calculation as their inclusion would be anti-dilutive2023202220232022
Stock Options38,100 — 38,100 3,250 
PSUs— — 12,800 1,353 
Total anti-dilutive shares38,100 — 50,900 4,603