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EARNINGS PER SHARE (Tables)
 3 Months Ended
Mar. 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 three months ended March 31, 2022 and 2021 (in millions, except share and per share data):
 Three Months Ended March 31,
 20222021
Weighted average basic common shares outstanding16,529,351 17,757,693 
Dilutive effect of stock-based awards and employee stock purchases 56,264 66,396 
Weighted average dilutive common shares outstanding16,585,614 17,824,088 
Basic:
Net income$202.9 $101.9 
Less: Earnings allocated to participating securities from continued operations5.8 3.4 
Less: Earnings allocated to participating securities from discontinued operations0.1 — 
Net income available to basic common shares$197.0 $98.5 
Basic earnings per common share$11.92 $5.54 
Diluted:
Net income$202.9 $101.9 
Less: Earnings allocated to participating securities from continued operations5.8 3.4 
Less: Earnings allocated to participating securities from discontinued operations0.1 — 
Net income available to diluted common shares$197.1 $98.5 
Diluted earnings per common share$11.88 $5.52