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STOCK-BASED COMPENSATION - Plans (Details) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) plan | Sep. 30, 2017 USD ($)
STOCK-BASED COMPENSATION |  |  |  |
Stock-based compensation plans | plan |  |  | 2 |
Compensation expense on share-based plans | $ 14.1 | $ 13.3 | $ 42.4 | $ 39.3
Excess tax benefit realized for tax deductions from non-qualified stock option exercises and disqualifying dispositions of incentive stock options | $ 3.1 | $ 2.5 | $ 7.7 | $ 13.8

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- Definition Amount of tax benefit from exercise of stock options granted under share-based compensation arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=96867065&loc=SL79508275-113901 + Details
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