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SHARE-BASED COMPENSATION PLANS - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions |  |  |  |  | 12 Months Ended | 132 Months Ended |  |
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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 |  |  |

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