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Net Income Per Common Share Computations
 12 Months Ended
Dec. 31, 2023
Earnings Per Share [Abstract]  
Net Income Per Common Share Computations
20. NET INCOME PER COMMON SHARE COMPUTATION
The following is a reconciliation of the numerator and denominator of the net income per common share computations:
Years Ended December 31,
(in millions, except per share data)202320222021
Numerator for basic net income per common share:
   Net income$417.3 $439.4 $249.1 
Denominator for net income per common share:
Basic75.2 75.9 77.2 
Plus dilutive effect of stock awards0.9 1.1 1.2 
Diluted76.1 77.0 78.4 
Net income per common share data:
Basic net income$5.55 $5.79 $3.22 
Diluted net income$5.49 $5.71 $3.18 
All share and per-share amounts have been retroactively adjusted to reflect the effects of the Stock Split. Refer to Note 10, Shareholders' Equity for further information on the Stock Split.