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EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Antidilutive Securities Excluded from Computation of Earnings Per Share        
Weighted average basic common shares outstanding (in shares) 15,189,333 17,753,957 15,886,739 17,753,042
Dilutive effect of stock-based awards and employee stock purchases (in shares) 59,115 82,298 57,145 76,940
Weighted average dilutive common shares outstanding (in shares) 15,248,448 17,836,255 15,943,883 17,829,982
Basic:        
Net income $ 195.7 $ 172.1 $ 594.6 $ 465.0
Net income available to basic common shares $ 190.3 $ 166.4 $ 577.9 $ 449.4
Basic earnings per common share (in dollars per shares) $ 12.53 $ 9.37 $ 36.38 $ 25.31
Diluted:        
Net income $ 195.7 $ 172.1 $ 594.6 $ 465.0
Net income available to diluted common shares $ 190.3 $ 166.4 $ 578.0 $ 449.4
Diluted earnings per common share (in dollars per share) $ 12.48 $ 9.33 $ 36.25 $ 25.21
Continuing Operations        
Basic:        
Less: (Loss) earnings allocated to participating securities $ 5.5 $ 5.7 $ 16.8 $ 15.6
Diluted:        
Less: (Loss) earnings allocated to participating securities 5.4 5.7 16.7 15.5
Discontinued operations        
Basic:        
Less: (Loss) earnings allocated to participating securities 0.0 0.0 (0.1) 0.1
Diluted:        
Less: (Loss) earnings allocated to participating securities $ 0.0 $ 0.0 $ (0.1) $ 0.1