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EARNINGS PER SHARE (Tables)
 9 Months Ended
Sep. 30, 2021
Earnings Per Share [Abstract]  
Schedule of calculation of EPS The following table sets forth the calculation of EPS for the three and nine months ended September 30, 2021 and 2020 (in millions, except share and per share data):
 Three Months Ended September 30,Nine Months Ended September 30,
 2021202020212020
Weighted average basic common shares outstanding17,753,957 17,776,888 17,753,042 17,770,619 
Dilutive effect of stock-based compensation and employee stock purchases 82,298 58,661 76,940 47,919 
Weighted average dilutive common shares outstanding17,836,255 17,835,549 17,829,982 17,818,538 
Basic:
Net income$172.1 $126.4 $465.0 $186.4 
Less: Earnings allocated to participating securities5.7 4.6 15.7 6.7 
Net income available to basic common shares$166.4 $121.9 $449.4 $179.7 
Basic earnings per common share$9.37 $6.86 $25.31 $10.11 
Diluted:
Net income$172.1 $126.4 $465.0 $186.4 
Less: Earnings allocated to participating securities5.7 4.5 15.6 6.7 
Net income available to diluted common shares$166.4 $121.9 $449.4 $179.7 
Diluted earnings per common share$9.33 $6.83 $25.21 $10.08