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EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                      
Weighted average basic common shares outstanding (in shares)                 17,655,365 17,754,666 17,917,195
Dilutive effect of stock-based awards and employee stock purchases (in shares)                 66,847 51,912 18,879
Weighted average dilutive common shares outstanding (in shares)                 17,722,212 17,806,578 17,936,075
Basic:                      
Net income $ 87.1 $ 172.1 $ 191.0 $ 101.9 $ 100.1 $ 126.4 $ 30.2 $ 29.8 $ 552.1 $ 286.5 $ 174.0
Net income available to basic common shares                 $ 533.5 $ 276.2 $ 167.6
Basic earnings (loss) per common share (in dollars per share) $ 4.85 $ 9.37 $ 10.40 $ 5.54 $ 5.45 $ 6.86 $ 1.64 $ 1.62 $ 30.22 $ 15.55 $ 9.35
Diluted:                      
Net income $ 87.1 $ 172.1 $ 191.0 $ 101.9 $ 100.1 $ 126.4 $ 30.2 $ 29.8 $ 552.1 $ 286.5 $ 174.0
Net income available to diluted common shares                 $ 533.6 $ 276.2 $ 167.6
Diluted earnings (loss) per common share (in dollars per share) $ 4.84 $ 9.33 $ 10.35 $ 5.52 $ 5.43 $ 6.83 $ 1.63 $ 1.61 $ 30.11 $ 15.51 $ 9.34
Continuing Operations                      
Basic:                      
Less: Earnings allocated to participating securities                 $ 21.1 $ 10.7 $ 6.3
Diluted:                      
Less: Earnings allocated to participating securities                 21.0 10.6 6.2
Discontinued Operations                      
Basic:                      
Less: Earnings allocated to participating securities                 (2.5) (0.4) 0.2
Diluted:                      
Less: Earnings allocated to participating securities                 $ (2.5) $ (0.4) $ 0.2