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EARNINGS PER SHARE (Tables)
 6 Months Ended
Jun. 30, 2021
Earnings Per Share [Abstract]  
Schedule of calculation of EPS The following table sets forth the calculation of EPS for the three and six months ended June 30, 2021 and 2020 (in millions, except share and per share data):
 Three Months Ended June 30,Six Months Ended June 30,
 2021202020212020
Weighted average basic common shares outstanding17,747,518 17,771,447 17,752,577 17,767,449 
Dilutive effect of stock-based awards and employee stock purchases 81,952 40,166 74,217 42,488 
Weighted average dilutive common shares outstanding17,829,470 17,811,613 17,826,794 17,809,937 
Basic:
Net income$191.0 $30.2 $292.9 $60.0 
Less: Earnings allocated to participating securities6.4 1.1 9.9 2.2 
Net income available to basic common shares$184.5 $29.1 $283.0 $57.8 
Basic earnings per common share$10.40 $1.64 $15.94 $3.25 
Diluted:
Net income$191.0 $30.2 $292.9 $60.0 
Less: Earnings allocated to participating securities6.4 1.1 9.9 2.1 
Net income available to diluted common shares$184.5 $29.1 $283.0 $57.8 
Diluted earnings per common share$10.35 $1.63 $15.88 $3.25