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STOCK-BASED COMPENSATION - Plans (Details) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) plan | Jun. 30, 2020 USD ($)
STOCK-BASED COMPENSATION |  |  |  |
Stock-based compensation plans | plan |  |  | 2 |
Compensation expense on share-based plans | $ 17.3 | $ 15.9 | $ 35.7 | $ 33.0
Excess tax benefit realized for tax deductions from non-qualified stock option exercises and disqualifying dispositions of incentive stock options | $ 2.7 | $ 4.0 | $ 4.1 | $ 5.7

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