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STOCK-BASED COMPENSATION - Plans (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 shares | Sep. 30, 2019 shares | Mar. 31, 2019 shares | Dec. 31, 2019 USD ($) plan shares | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
STOCK-BASED COMPENSATION |  |  |  |  |  |
Stock-based compensation plans | plan |  |  |  | 2 |  |
Compensation expense on share-based plans | $ |  |  |  | $ 63.4 | $ 57.1 | $ 52.3
Excess tax benefit realized for tax deductions from non-qualified stock option exercises and disqualifying dispositions of incentive stock options | $ |  |  |  | $ 25.9 | $ 8.5 | $ 96.7
Stock options |  |  |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |  |  |
Granted (in shares) | 50,000 | 52,000 | 1,570,000 |  |  |
2011 Omnibus Incentive Plan |  |  |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |  |  |
Aggregate amount of common stock authorized (in shares) | 43,500,000 |  |  | 43,500,000 |  |
Reduction in number of shares for each share granted |  |  |  | 2.16 |  |
Vesting period |  |  |  | 5 years |  |
Granted (in shares) |  |  |  | 24,555,792 |  |
Expiration period (in years) |  |  |  | 10 years |  |
Shares available for grant | 14,169,367 |  |  | 14,169,367 |  |
2017 Directors plan |  |  |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |  |  |
Aggregate amount of common stock authorized (in shares) | 1,250,000 |  |  | 1,250,000 |  |
Granted (in shares) |  |  |  | 68,774 |  |
Shares available for grant | 1,181,226 |  |  | 1,181,226 |  |
Number of common shares held and expected to vest for eligibility under plan | 9,000 |  |  | 9,000 |  |

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