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EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Antidilutive Securities Excluded from Computation of Earnings Per Share        
Weighted average basic common shares outstanding (in shares) 13,777,225 15,956,258 13,819,024 16,241,221
Dilutive effect of stock-based awards and employee stock purchases (in shares) 40,058 56,024 46,711 56,143
Weighted average dilutive common shares outstanding (in shares) 13,817,283 16,012,282 13,865,736 16,297,364
Basic:        
Net income $ 170.5 $ 195.9 $ 329.0 $ 398.9
Net income available to basic common shares $ 166.4 $ 190.6 $ 320.7 $ 387.6
Basic earnings per common share (in dollars per shares) $ 12.08 $ 11.94 $ 23.21 $ 23.87
Diluted:        
Net income $ 170.5 $ 195.9 $ 329.0 $ 398.9
Net income available to diluted common shares $ 166.4 $ 190.6 $ 320.8 $ 387.6
Diluted earnings per common share (in dollars per share) $ 12.04 $ 11.90 $ 23.13 $ 23.79
Continuing Operations        
Basic:        
Less: Earnings (loss) allocated to participating securities $ 4.2 $ 5.5 $ 8.2 $ 11.3
Diluted:        
Less: Earnings (loss) allocated to participating securities 4.1 5.4 8.2 11.3
Discontinued operations        
Basic:        
Less: Earnings (loss) allocated to participating securities 0.0 (0.1) 0.0 0.0
Diluted:        
Less: Earnings (loss) allocated to participating securities $ 0.0 $ (0.1) $ 0.0 $ 0.0