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EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Antidilutive Securities Excluded from Computation of Earnings Per Share        
Weighted average basic common shares outstanding (in shares) 15,956,258 17,747,518 16,241,221 17,752,577
Dilutive effect of stock-based awards and employee stock purchases (in shares) 56,024 81,952 56,143 74,217
Weighted average dilutive common shares outstanding (in shares) 16,012,282 17,829,470 16,297,364 17,826,794
Basic:        
Net income $ 195.9 $ 191.0 $ 398.9 $ 292.9
Net income available to basic common shares $ 190.6 $ 184.5 $ 387.6 $ 283.0
Basic earnings per common share (in dollars per shares) $ 11.94 $ 10.40 $ 23.87 $ 15.94
Diluted:        
Net income $ 195.9 $ 191.0 $ 398.9 $ 292.9
Net income available to diluted common shares $ 190.6 $ 184.5 $ 387.6 $ 283.0
Diluted earnings per common share (in dollars per share) $ 11.90 $ 10.35 $ 23.79 $ 15.88
Continuing Operations        
Basic:        
Less: (Loss) earnings allocated to participating securities $ 5.5 $ 6.4 $ 11.3 $ 9.8
Diluted:        
Less: (Loss) earnings allocated to participating securities 5.4 6.3 11.3 9.8
Discontinued operations        
Basic:        
Less: (Loss) earnings allocated to participating securities (0.1) 0.1 0.0 0.1
Diluted:        
Less: (Loss) earnings allocated to participating securities $ (0.1) $ 0.1 $ 0.0 $ 0.1