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STOCK-BASED COMPENSATION - Narrative (Details) |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 01, 2020 USD ($) | May 31, 2013 shares | Dec. 31, 2020 USD ($) plan shares | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of share-based award plans | plan |  |  | 1 |  |
Increase in reserve under share-based award plan, number of shares (in shares) | shares |  | 11,000,000 |  |  |
Total income tax benefit recognized for stock-based compensation expense |  |  | $ 13,000,000.0 | $ 12,200,000 | $ 9,700,000
Stock options vesting percentage for each year of completed service |  |  | 33.00% |  |
Stock options expiration periods |  |  | 10 years |  |
Total shareholder return, period |  |  | 3 years |  |
Cumulative adjusted earnings per share, period |  |  | 3 years |  |
Minimum percentage of target to which shares may be issued |  |  | 0.00% |  |
Maximum percentage of target to which shares may be issued |  |  | 200.00% |  |
Percentage of target that shares may be issued |  |  | 100.00% |  |
Minimum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based payment award options nonvested number of shares | shares |  |  | 290,033 |  |
Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based payment award options nonvested number of shares | shares |  |  | 580,066 |  |
Stock Options |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Total intrinsic value of stock options exercised |  |  | $ 20,300,000 | 18,600,000 | 13,300,000
Total unrecognized compensation cost |  |  | $ 7,100,000 |  |
Total unrecognized compensation cost, weighted-average period of recognition |  |  | 1 year 3 months 18 days |  |
Stock Options | Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock awards vesting periods (up to) |  |  | 3 years |  |
Nonvested Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Total unrecognized compensation cost |  |  | $ 39,900,000 |  |
Total unrecognized compensation cost, weighted-average period of recognition |  |  | 1 year 7 months 6 days |  |
Total weighted-average fair value of nonvested stock vested, based on the vesting date |  |  | $ 44,000,000.0 | 32,600,000 | 50,200,000
Total weighted-average fair value of nonvested stock vested, based on the grant date |  |  | $ 32,500,000 | $ 30,500,000 | $ 40,400,000
Nonvested Stock | Minimum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock awards vesting periods (up to) |  |  | 1 year |  |
Nonvested Stock | Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock awards vesting periods (up to) |  |  | 3 years |  |
Employee Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
ESPP annual amount of employee withholdings | $ 25,000 |  |  |  |
ESPP, discount on closing stock price (as a percent) | 5.00% |  |  |  |
Employee Stock | Minimum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
ESPP, option to withhold amount of salary (as a percent) | 1.00% |  |  |  |
Employee Stock | Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
ESPP, option to withhold amount of salary (as a percent) | 10.00% |  |  |  |

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