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EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Antidilutive Securities Excluded from Computation of Earnings Per Share      
Weighted average basic common shares outstanding (in shares) 13,681,660 15,441,292 17,655,365
Dilutive effect of stock-based awards and employee stock purchases (in shares) 53,139 52,324 66,847
Weighted average dilutive common shares outstanding (in shares) 13,734,799 15,493,616 17,722,212
Basic:      
Net income $ 601.6 $ 751.5 $ 552.1
Net income available to basic common shares $ 586.8 $ 730.3 $ 533.5
Basic earnings per common share (in dollars per share) $ 42.89 $ 47.29 $ 30.22
Diluted:      
Net income $ 601.6 $ 751.5 $ 552.1
Net income available to diluted common shares $ 586.9 $ 730.3 $ 533.6
Diluted earnings per common share (in dollars per share) $ 42.73 $ 47.14 $ 30.11
Continuing Operations      
Basic:      
Less: Earnings (loss) allocated to participating securities $ 14.8 $ 21.3 $ 21.1
Diluted:      
Less: Earnings (loss) allocated to participating securities 14.8 21.3 21.0
Discontinued Operations      
Basic:      
Less: Earnings (loss) allocated to participating securities 0.0 (0.1) (2.5)
Diluted:      
Less: Earnings (loss) allocated to participating securities $ 0.0 $ (0.1) $ (2.5)