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Earnings Per Share (Tables)
3 Months Ended
Mar. 31, 2025
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 months ended March 31, 2025 and 2024:

 Three Months Ended
March 31,
(Millions of dollars, except share and per share amounts)20252024
Earnings per common share:  
Net income per share - basic
Net income attributable to common stockholders$53.2 $66.0 
Weighted average common shares outstanding (in thousands)19,929 20,814 
Earnings per common share$2.67 $3.17 

Three Months Ended
March 31,
(Millions of dollars, except share and per share amounts)20252024
Earnings per common share - assuming dilution:  
Net income per share - diluted
Net income attributable to common stockholders$53.2 $66.0 
Weighted average common shares outstanding (in thousands)19,929 20,814 
Common equivalent shares:  
Dilutive share-based awards275 348 
Weighted average common shares outstanding - assuming dilution
(in thousands)
20,204 21,162 
Earnings per common share assuming dilution$2.63 $3.12 
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
March 31,
Potentially dilutive shares excluded from the calculation as their inclusion would be anti-dilutive20252024
Stock Options47,623 16,597 
RSUs4,912 151 
PSUs9,824 5,689 
Total anti-dilutive shares62,359 22,437