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EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Weighted average basic common shares outstanding (in shares) 15,441,292 17,655,365 17,754,666
Dilutive effect of stock-based awards and employee stock purchases (in shares) 52,324 66,847 51,912
Weighted average dilutive common shares outstanding (in shares) 15,493,616 17,722,212 17,806,578
Basic:      
Net income $ 751.5 $ 552.1 $ 286.5
Net income available to basic common shares $ 730.3 $ 533.5 $ 276.2
Basic earnings per common share (in dollars per share) $ 47.29 $ 30.22 $ 15.55
Diluted:      
Net income $ 751.5 $ 552.1 $ 286.5
Net income available to diluted common shares $ 730.3 $ 533.6 $ 276.2
Diluted earnings per common share (in dollars per share) $ 47.14 $ 30.11 $ 15.51
Continuing Operations      
Basic:      
Less: Earnings (loss) allocated to participating securities $ 21.3 $ 21.1 $ 10.7
Diluted:      
Less: Earnings (loss) allocated to participating securities 21.3 21.0 10.6
Discontinued Operations      
Basic:      
Less: Earnings (loss) allocated to participating securities (0.1) (2.5) (0.4)
Diluted:      
Less: Earnings (loss) allocated to participating securities $ (0.1) $ (2.5) $ (0.4)