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EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Basic and Diluted Earnings per share    
Weighted average basic common shares outstanding (in shares) 16,529,351 17,757,693
Dilutive effect of stock-based awards and employee stock purchases (in shares) 56,264 66,396
Weighted average dilutive common shares outstanding (in shares) 16,585,614 17,824,088
Basic:    
Net income $ 202.9 $ 101.9
Net income available to basic common shares $ 197.0 $ 98.5
Basic earnings per common share (in dollars per shares) $ 11.92 $ 5.54
Diluted:    
Net income $ 202.9 $ 101.9
Net income available to diluted common shares $ 197.1 $ 98.5
Diluted earnings per common share (in dollars per share) $ 11.88 $ 5.52
Continuing Operations    
Basic:    
Less: Earnings allocated to participating securities $ 5.8 $ 3.4
Diluted:    
Less: Earnings allocated to participating securities 5.8 3.4
Discontinued Operations    
Basic:    
Less: Earnings allocated to participating securities 0.1 0.0
Diluted:    
Less: Earnings allocated to participating securities $ 0.1 $ 0.0