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STOCK-BASED COMPENSATION - Plans (Details) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) plan | Sep. 30, 2020 USD ($)
STOCK-BASED COMPENSATION |  |  |  |
Stock-based compensation plans | plan |  |  | 2 |
Compensation expense on share-based plans | $ 16.7 | $ 19.5 | $ 52.4 | $ 53.0
Excess tax benefit realized for tax deductions from non-qualified stock option exercises and disqualifying dispositions of incentive stock options | $ 2.0 | $ 3.5 | $ 6.1 | $ 9.2

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