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SHARE-BASED COMPENSATION PLANS - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended 132 Months Ended
Nov. 08, 2023
Sep. 08, 2023
May 18, 2023
Feb. 23, 2023
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2022
Dec. 31, 2020
Jun. 30, 2020
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                    
Share-based compensation expense         $ 49.0 $ 45.0 $ 43.0      
Income tax benefit recorded         7.0 $ 4.0 $ 8.0      
Granted (in shares)           0 0      
Additional paid-in capital due to tax benefit from dividends on restricted shares         $ 0.5 $ 0.6 $ 0.6      
Options outstanding         0 0 49,028 0 116,871  
Unrecognized compensation cost         $ 108.0          
Unrecognized compensation cost expected to be recognized over a weighted-average period, years         3 years 3 months 18 days          
Fair value of shares vested         $ 41.0 $ 40.0 $ 38.0      
Tax benefit from stock options vested         $ 11.0 $ 9.0 $ 8.0      
2020 Employee Plan                    
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                    
Shares authorized                   1,400,000
Remaining shares         783,579          
2009 Director Plan                    
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                    
Shares authorized         37,439          
Remaining shares         34,617          
2003 Director Plan                    
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                    
Shares authorized         500,000          
Remaining shares         271,245          
Non-Employee Directors                    
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                    
Common shares, issued (in shares)         447 774 506 774    
Aggregate value of issuances         $ 0.2 $ 0.2 $ 0.1      
Options and Restricted Shares | 2009 Director Plan                    
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                    
Expiration period, in years         10 years          
Options and Restricted Shares | 2003 Director Plan                    
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                    
Vesting period, years         3 years          
Options and Restricted Shares | 2003 Director Plan | Share-Based Payment Arrangement, Tranche One                    
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                    
Vesting percentage         33.00%          
Options and Restricted Shares | 2020 Employee Plan, 2010 Employee Plan and 2002 Employee Plan                    
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                    
Vesting period, years         5 years          
Options and Restricted Shares | 2020 Employee Plan, 2010 Employee Plan and 2002 Employee Plan | Share-Based Payment Arrangement, Tranche One                    
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                    
Vesting percentage         20.00%          
Options and Restricted Shares | Non-Employee Directors                    
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                    
Common stock acquired for net-share settlement (in shares)         56,832 69,833 79,308      
Common stock values of shares acquired for net-share settlement         $ 22.0 $ 21.0 $ 18.0      
Performance Shares                    
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                    
Granted (in shares)       14,975            
Weighted-average grant-date fair value of options granted (in dollars per share)       $ 382.3850            
Performance Shares | 2020 Employee Plan and 2010 Employee Plan                    
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                    
Vesting period, years         3 years          
Performance Shares | 2020 Employee Plan and 2010 Employee Plan | Minimum                    
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                    
Shares of stock per unit awarded (in shares)         0          
Performance Shares | 2020 Employee Plan and 2010 Employee Plan | Maximum                    
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                    
Shares of stock per unit awarded (in shares)         1.75          
Performance Shares | 2020 Employee Plan and 2010 Employee Plan | Share-Based Payment Arrangement, Tranche One                    
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                    
Vesting percentage         100.00%          
Performance Shares | Non-Employee Directors                    
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                    
Common stock acquired for net-share settlement (in shares)         6,117 6,175 3,104      
Common stock values of shares acquired for net-share settlement         $ 2.1 $ 1.7 $ 0.8      
Restricted Shares                    
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                    
Granted (in shares)         181,646          
Weighted-average grant-date fair value of options granted (in dollars per share) $ 383.2200 $ 369.15 $ 372.9050 $ 382.385            
Stock Option                    
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                    
Granted (in shares)         0     0    
Aggregate intrinsic value of options exercised           10.0 11.0 $ 10.0    
Cash received from the exercised share options           4.0 6.0      
Tax benefit from options exercised           $ 2.0 $ 3.0