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EARNINGS PER SHARE (Tables)
 12 Months Ended
Dec. 31, 2022
Earnings Per Share [Abstract]  
Calculation of earnings per share The following table sets forth the calculation of EPS on total net income for the years ended December 31, 2022, 2021 and 2020 (in millions, except share and per share data):
 Years Ended December 31,
 202220212020
Weighted average basic common shares outstanding15,441,292 17,655,365 17,754,666 
Dilutive effect of stock-based awards and employee stock purchases52,324 66,847 51,912 
Weighted average dilutive common shares outstanding15,493,616 17,722,212 17,806,578 
Basic:
Net income$751.5 $552.1 $286.5 
Less: Earnings allocated to participating securities from continuing operations21.3 21.1 10.7 
Less: Loss allocated to participating securities from discontinued operations(0.1)(2.5)(0.4)
Net income available to basic common shares$730.3 $533.5 $276.2 
Basic earnings per common share$47.29 $30.22 $15.55 
Diluted:
Net income$751.5 $552.1 $286.5 
Less: Earnings allocated to participating securities from continuing operations21.3 21.0 10.6 
Less: Loss allocated to participating securities from discontinued operations(0.1)(2.5)(0.4)
Net income available to diluted common shares$730.3 $533.6 $276.2 
Diluted earnings per common share$47.14 $30.11 $15.51