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EARNINGS (LOSS) PER SHARE (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Basic and Diluted Earnings per share    
Weighted average basic common shares outstanding (in shares) 17,757,693 17,763,451
Dilutive effect of employee stock purchases, net of assumed repurchase of treasury stock (in shares) 66,396 44,810
Weighted average dilutive common shares outstanding (in shares) 17,824,088 17,808,261
Basic:    
Net income (loss) $ 101.9 $ 29.8
Less: Earnings (loss) allocated to participating securities 3.5 1.1
Net income (loss) available to basic common shares $ 98.5 $ 28.7
Basic earnings (loss) per common share (in dollars per share) $ 5.54 $ 1.62
Diluted:    
Net income (loss) $ 101.9 $ 29.8
Less: Earnings (loss) allocated to participating securities 3.5 1.1
Net income (loss) available to diluted common shares $ 98.5 $ 28.7
Diluted earnings (loss) per common share (in dollars per share) $ 5.52 $ 1.61