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EARNINGS PER SHARE (Tables)
 9 Months Ended
Sep. 30, 2023
Earnings Per Share [Abstract]  
Schedule of Calculation of Earnings Per Share The following table sets forth the calculation of EPS (in millions, except share and per share data):
 Three Months Ended September 30,Nine Months Ended September 30,
 2023202220232022
Weighted average basic common shares outstanding13,661,059 15,189,333 13,765,791 15,886,739 
Dilutive effect of stock-based awards and employee stock purchases 57,669 59,115 50,404 57,145 
Weighted average dilutive common shares outstanding13,718,728 15,248,448 13,816,194 15,943,883 
Basic:
Net income$163.9 $195.7 $492.9 $594.6 
Less: Earnings allocated to participating securities from continuing operations4.0 5.5 12.3 16.8 
Less: Loss allocated to participating securities to discontinued operations— — — (0.1)
Net income available to basic common shares$159.9 $190.3 $480.6 $577.9 
Basic earnings per common share$11.70 $12.53 $34.91 $36.38 
Diluted:
Net income$163.9 $195.7 $492.9 $594.6 
Less: Earnings allocated to participating securities from continuing operations4.0 5.4 12.2 16.7 
Less: Loss allocated to participating securities to discontinued operations— — — (0.1)
Net income available to diluted common shares$159.9 $190.3 $480.6 $578.0 
Diluted earnings per common share$11.65 $12.48 $34.79 $36.25