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EARNINGS PER SHARE (Tables)
 6 Months Ended
Jun. 30, 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 three and six months ended June 30, 2022 and 2021 (in millions, except share and per share data):
 Three Months Ended June 30,Six Months Ended June 30,
 2022202120222021
Weighted average basic common shares outstanding15,956,258 17,747,518 16,241,221 17,752,577 
Dilutive effect of stock-based awards and employee stock purchases 56,024 81,952 56,143 74,217 
Weighted average dilutive common shares outstanding16,012,282 17,829,470 16,297,364 17,826,794 
Basic:
Net income$195.9 $191.0 $398.9 $292.9 
Less: Earnings allocated to participating securities from continued operations5.5 6.4 11.3 9.8 
Less: (Loss) earnings allocated to participating securities from discontinued operations(0.1)0.1 — 0.1 
Net income available to basic common shares$190.6 $184.5 $387.6 $283.0 
Basic earnings per common share$11.94 $10.40 $23.87 $15.94 
Diluted:
Net income$195.9 $191.0 $398.9 $292.9 
Less: Earnings allocated to participating securities from continued operations5.4 6.3 11.3 9.8 
Less: (Loss) earnings allocated to participating securities from discontinued operations(0.1)0.1 — 0.1 
Net income available to diluted common shares$190.6 $184.5 $387.6 $283.0 
Diluted earnings per common share$11.90 $10.35 $23.79 $15.88