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EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Antidilutive Securities Excluded from Computation of Earnings Per Share        
Weighted average basic common shares outstanding (in shares) 13,226,129 13,777,225 13,277,425 13,819,024
Dilutive effect of stock-based awards and employee stock purchases (in shares) 67,927 40,058 63,987 46,711
Weighted average dilutive common shares outstanding (in shares) 13,294,056 13,817,283 13,341,412 13,865,736
Basic:        
Net income $ 138.2 $ 170.5 $ 286.1 $ 329.0
Net income available to basic common shares $ 135.2 $ 166.4 $ 279.8 $ 320.7
Basic earnings per common share (in dollars per shares) $ 10.22 $ 12.08 $ 21.07 $ 23.21
Diluted:        
Net income $ 138.2 $ 170.5 $ 286.1 $ 329.0
Net income available to diluted common shares $ 135.2 $ 166.4 $ 279.8 $ 320.8
Diluted earnings per common share (in dollars per share) $ 10.17 $ 12.04 $ 20.97 $ 23.13
Continuing Operations        
Basic:        
Less: Earnings (Loss) allocated to participating securities $ 2.9 $ 4.2 $ 6.3 $ 8.2
Diluted:        
Less: Earnings (Loss) allocated to participating securities 2.9 4.1 6.3 8.2
Discontinued operations        
Basic:        
Less: Earnings (Loss) allocated to participating securities 0.0 0.0 0.0 0.0
Diluted:        
Less: Earnings (Loss) allocated to participating securities $ 0.0 $ 0.0 $ 0.0 $ 0.0