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EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Antidilutive Securities Excluded from Computation of Earnings Per Share        
Weighted average basic common shares outstanding (in shares) 13,139,393 13,661,059 13,231,079 13,765,791
Dilutive effect of stock-based awards and employee stock purchases (in shares) 76,924 57,669 68,331 50,404
Weighted average dilutive common shares outstanding (in shares) 13,216,317 13,718,728 13,299,410 13,816,194
Basic:        
Net income $ 117.3 $ 163.9 $ 403.3 $ 492.9
Net income available to basic common shares $ 114.9 $ 159.9 $ 394.7 $ 480.6
Basic earnings per common share (in dollars per share) $ 8.74 $ 11.70 $ 29.83 $ 34.91
Diluted:        
Net income $ 117.3 $ 163.9 $ 403.3 $ 492.9
Net income available to diluted common shares $ 114.9 $ 159.9 $ 394.7 $ 480.6
Diluted earnings per common share (in dollars per share) $ 8.69 $ 11.65 $ 29.68 $ 34.79
Continuing Operations        
Basic:        
Less: Earnings allocated to participating securities $ 2.4 $ 4.0 $ 8.6 $ 12.3
Diluted:        
Less: Earnings allocated to participating securities 2.4 4.0 8.6 12.2
Discontinued operations        
Basic:        
Less: Earnings allocated to participating securities 0.0 0.0 0.0 0.0
Diluted:        
Less: Earnings allocated to participating securities $ 0.0 $ 0.0 $ 0.0 $ 0.0