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EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Antidilutive Securities Excluded from Computation of Earnings Per Share    
Weighted average basic common shares outstanding (in shares) 13,861,289 16,529,351
Dilutive effect of stock-based awards and employee stock purchases (in shares) 53,438 56,264
Weighted average dilutive common shares outstanding (in shares) 13,914,727 16,585,614
Basic:    
Net income $ 158.4 $ 202.9
Net income available to basic common shares $ 154.4 $ 197.0
Basic earnings per common share (in dollars per shares) $ 11.14 $ 11.92
Diluted:    
Net income $ 158.4 $ 202.9
Net income available to diluted common shares $ 154.4 $ 197.1
Diluted earnings per common share (in dollars per share) $ 11.10 $ 11.88
Continuing Operations    
Basic:    
Less: Earnings (loss) allocated from participating securities $ 4.1 $ 5.8
Diluted:    
Less: Earnings (loss) allocated from participating securities 4.1 5.8
Discontinued operations    
Basic:    
Less: Earnings (loss) allocated from participating securities 0.0 0.1
Diluted:    
Less: Earnings (loss) allocated from participating securities $ 0.0 $ 0.1