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STOCK-BASED COMPENSATION - Plans (Details) $ in Millions | 3 Months Ended
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Mar. 31, 2021 USD ($) plan | Mar. 31, 2020 USD ($)
STOCK-BASED COMPENSATION |  |
Stock-based compensation plans | plan | 2 |
Compensation expense on share-based plans | $ 18.4 | $ 17.1
Excess tax benefit realized for tax deductions from non-qualified stock option exercises and disqualifying dispositions of incentive stock options | $ 1.4 | $ 1.7

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- Definition Amount of tax benefit from exercise of option under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=116856206&loc=SL79508275-113901 + Details
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