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EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Antidilutive Securities Excluded from Computation of Earnings Per Share        
Weighted average basic common shares outstanding (in shares) 13,661,059 15,189,333 13,765,791 15,886,739
Dilutive effect of stock-based awards and employee stock purchases (in shares) 57,669 59,115 50,404 57,145
Weighted average dilutive common shares outstanding (in shares) 13,718,728 15,248,448 13,816,194 15,943,883
Basic:        
Net income $ 163.9 $ 195.7 $ 492.9 $ 594.6
Net income available to basic common shares $ 159.9 $ 190.3 $ 480.6 $ 577.9
Basic earnings per common share (in dollar per shares) $ 11.70 $ 12.53 $ 34.91 $ 36.38
Diluted:        
Net income $ 163.9 $ 195.7 $ 492.9 $ 594.6
Net income available to diluted common shares $ 159.9 $ 190.3 $ 480.6 $ 578.0
Diluted earnings per common share (in dollar per share) $ 11.65 $ 12.48 $ 34.79 $ 36.25
Continuing Operations        
Basic:        
Less: Earnings (loss) allocated to participating securities $ 4.0 $ 5.5 $ 12.3 $ 16.8
Diluted:        
Less: Earnings (loss) allocated to participating securities 4.0 5.4 12.2 16.7
Discontinued operations        
Basic:        
Less: Earnings (loss) allocated to participating securities 0.0 0.0 0.0 (0.1)
Diluted:        
Less: Earnings (loss) allocated to participating securities $ 0.0 $ 0.0 $ 0.0 $ (0.1)