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STOCK-BASED COMPENSATION - Plans (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 shares | Dec. 31, 2020 USD ($) plan shares | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($)
STOCK-BASED COMPENSATION |  |  |  |
Stock-based compensation plans | plan |  | 2 |  |
Aggregate amount of common stock authorized (in shares) |  | 46,169,367 |  |
Compensation expense on share-based plans | $ |  | $ 70.3 | $ 63.4 | $ 57.1
Excess tax benefit realized for tax deductions from non-qualified stock option exercises and disqualifying dispositions of incentive stock options | $ |  | $ 10.5 | $ 25.9 | $ 8.5
Stock Options |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |
Granted (in shares) | 1,027,000 |  |  |
2020 Omnibus Incentive Plan |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |
Reduction in number of shares for each share granted |  | 1 |  |
2020 Omnibus Incentive Plan | Stock Options |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |
Expiration period (in years) |  | 10 years |  |
2020 Omnibus Incentive Plan | Stock Options | Maximum |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |
Expiration period (in years) |  | 5 years |  |
2020 Omnibus Incentive Plan | Restricted Stock Units and Performance Share Units | Minimum |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |
Expiration period (in years) |  | 3 years |  |
Vesting period |  | 3 years |  |
2020 Omnibus Incentive Plan | Restricted Stock Units and Performance Share Units | Maximum |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |
Vesting period |  | 5 years |  |
2011 Omnibus Incentive Plan |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |
Aggregate amount of common stock authorized (in shares) |  | 32,000,000 | 14,169,367 |
Reduction in number of shares for each share granted |  | 2.6 |  |
Shares available for grant |  | 44,201,385 |  |
Granted (in shares) |  | 1,431,030 |  |
2017 Directors plan |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |
Aggregate amount of common stock authorized (in shares) |  | 1,250,000 |  |
Shares available for grant |  | 1,164,301 |  |
Granted (in shares) |  | 85,699 |  |
Number of common shares held and expected to vest for eligibility under plan |  | 9,000 |  |

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