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EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Basic and Diluted Earnings per share        
Weighted average basic common shares outstanding (in shares) 17,753,957 17,776,888 17,753,042 17,770,619
Dilutive effect of employee stock purchases, net of assumed repurchase of treasury stock (in shares) 82,298 58,661 76,940 47,919
Weighted average dilutive common shares outstanding (in shares) 17,836,255 17,835,549 17,829,982 17,818,538
Basic:        
Net income $ 172.1 $ 126.4 $ 465.0 $ 186.4
Less: Earnings allocated to participating securities 5.7 4.6 15.7 6.7
Net income available to basic common shares $ 166.4 $ 121.9 $ 449.4 $ 179.7
Basic earnings per common share (in dollars per share) $ 9.37 $ 6.86 $ 25.31 $ 10.11
Diluted:        
Net income $ 172.1 $ 126.4 $ 465.0 $ 186.4
Less: Earnings allocated to participating securities 5.7 4.5 15.6 6.7
Net income available to diluted common shares $ 166.4 $ 121.9 $ 449.4 $ 179.7
Diluted earnings per common share (in dollars per share) $ 9.33 $ 6.83 $ 25.21 $ 10.08