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EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Antidilutive Securities Excluded from Computation of Earnings Per Share        
Weighted average basic common shares outstanding (in shares) 12,766,975 13,139,393 12,879,200 13,231,079
Dilutive effect of stock-based awards and employee stock purchases (in shares) 26,986 76,924 26,418 68,331
Weighted average dilutive common shares outstanding (in shares) 12,793,961 13,216,317 12,905,618 13,299,410
Basic:        
Net income $ 13.0 $ 117.3 $ 281.6 $ 403.3
Net income available to basic common shares $ 12.8 $ 114.9 $ 278.4 $ 394.7
Basic earnings per share (in dollars per share) $ 1.00 $ 8.74 $ 21.61 $ 29.83
Diluted:        
Net income $ 13.0 $ 117.3 $ 281.6 $ 403.3
Net income available to diluted common shares $ 12.8 $ 114.9 $ 278.4 $ 394.7
Diluted earnings per common share (in dollars per share) $ 1.00 $ 8.69 $ 21.57 $ 29.68
Continuing Operations        
Basic:        
Less: Earnings allocated to participating securities $ 0.1 $ 2.4 $ 3.2 $ 8.6
Diluted:        
Less: Earnings allocated to participating securities 0.1 2.4 3.2 8.6
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