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SHARE-BASED COMPENSATION PLANS - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions						12 Months Ended			156 Months Ended
	Nov. 07, 2024	Sep. 12, 2024	Mar. 15, 2024	Feb. 29, 2024	Feb. 28, 2024	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2024	Jun. 30, 2020
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-based compensation expense						$ 63.0	$ 49.0	$ 45.0
Income tax benefit recorded						8.0	7.0	4.0
Additional paid-in capital due to tax benefit from dividends on restricted shares						$ 0.6	$ 0.5	0.6
Options outstanding						0	0		0
Unrecognized compensation cost						$ 113.0
Unrecognized compensation cost expected to be recognized over a weighted-average period, years						2 years 4 months 24 days
Fair value of shares vested						$ 43.0	$ 41.0	40.0
Tax benefit from stock options vested						$ 9.0	$ 11.0	$ 9.0
2020 Employee Plan
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Shares authorized										1,400,000
Remaining shares						554,882
2009 Director Plan
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Shares authorized						37,439			37,439
Remaining shares						34,617
2003 Director Plan
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Shares authorized						500,000			500,000
Remaining shares						264,704
Non-Employee Directors
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Common shares, issued (in shares)						324	447	774	324
Aggregate value of issuances						$ 0.1	$ 0.2	$ 0.2
Options and Restricted Shares \| 2020 Employee Plan
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Vesting period, years						3 years	5 years
Options and Restricted Shares \| 2020 Employee Plan \| Share-Based Payment Arrangement, Tranche One
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Vesting percentage						33.30%	20.00%
Options and Restricted Shares \| 2020 Employee Plan \| Share-Based Payment Arrangement, Tranche Two
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Vesting percentage						33.30%	20.00%
Options and Restricted Shares \| 2020 Employee Plan \| Share-Based Payment Arrangement, Tranche Three
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Vesting percentage						33.30%	20.00%
Options and Restricted Shares \| 2020 Employee Plan \| Share-Based Payment Arrangement, Tranche Four
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Vesting percentage							20.00%
Options and Restricted Shares \| 2020 Employee Plan \| Share-Based Payment Arrangement, Tranche Five
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Vesting percentage							20.00%
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 \| 2003 Director Plan \| Share-Based Payment Arrangement, Tranche Two
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Vesting percentage						33.00%
Options and Restricted Shares \| 2003 Director Plan \| Share-Based Payment Arrangement, Tranche Three
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Vesting percentage						33.00%
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)						54,537	56,832	69,833
Common stock values of shares acquired for net-share settlement						$ 20.0	$ 22.0	$ 21.0
Performance Shares
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Granted (in shares)					18,713
Weighted-average grant-date fair value of options granted (in dollars per share)					$ 369.52
Performance Shares \| 2020 Employee Plan
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Vesting percentage						100.00%
Vesting period, years						3 years
Performance Shares \| 2020 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 \| Maximum
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Shares of stock per unit awarded (in shares)						1.75
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)						11,336	6,117	6,175
Common stock values of shares acquired for net-share settlement						$ 4.0	$ 2.0	$ 2.0
Restricted Shares
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Granted (in shares)						222,196
Weighted-average grant-date fair value of options granted (in dollars per share)	$ 365.61	$ 376.58	$ 377.80	$ 367.04	$ 369.52
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
Cash received from the exercised share options								4.0
Tax benefit from options exercised								$ 2.0