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EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Antidilutive Securities Excluded from Computation of Earnings Per Share    
Weighted average basic common shares outstanding (in shares) 13,328,721 13,861,289
Dilutive effect of stock-based awards and employee stock purchases (in shares) 60,048 53,438
Weighted average dilutive common shares outstanding (in shares) 13,388,769 13,914,727
Basic:    
Net income $ 147.9 $ 158.4
Net income available to basic common shares $ 144.5 $ 154.4
Basic earnings per common share (in dollar per shares) $ 10.84 $ 11.14
Diluted:    
Net income $ 147.9 $ 158.4
Net income available to diluted common shares $ 144.6 $ 154.4
Diluted earnings per common share (in dollar per share) $ 10.80 $ 11.10
Continuing Operations    
Basic:    
Less: Earnings (loss) allocated to participating securities $ 3.3 $ 4.1
Diluted:    
Less: Earnings (loss) allocated to participating securities 3.3 4.1
Discontinued operations    
Basic:    
Less: Earnings (loss) allocated to participating securities 0.0 0.0
Diluted:    
Less: Earnings (loss) allocated to participating securities $ 0.0 $ 0.0