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STOCK-BASED COMPENSATION - Plans (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 shares | Sep. 30, 2018 shares | Jun. 30, 2018 shares | Mar. 31, 2018 shares | Dec. 31, 2018 USD ($) plan shares | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
STOCK-BASED COMPENSATION |  |  |  |  |  |  |
Number of Stock Based Compensation Plans | plan |  |  |  |  | 2 |  |
Compensation expense on share-based plans | $ |  |  |  |  | $ 57.1 | $ 52.3 | $ 45.8
Excess tax benefit realized for tax deductions from non-qualified stock option exercises and disqualifying dispositions of incentive stock options | $ |  |  |  |  | $ 8.5 | $ 96.7 | $ 20.8
Stock options |  |  |  |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |  |  |  |
Common stock granted, net of cancellations (in shares) | 194,000 | 11,000 | 360,000 | 2,615,000 |  |  |
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 |  |
Expiration period (in years) |  |  |  |  | 10 years |  |
Common stock granted, net of cancellations (in shares) |  |  |  |  | 22,740,597 |  |
Shares available for grant | 16,611,623 |  |  |  | 16,611,623 |  |
2017 Directors plan |  |  |  |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |  |  |  |
Aggregate amount of common stock authorized (in shares) | 1,250,000 |  |  |  | 1,250,000 |  |
Common stock granted, net of cancellations (in shares) |  |  |  |  | 47,880 |  |
Shares available for grant | 1,202,120 |  |  |  | 1,202,120 |  |
Number of common shares held and expected to vest for eligibility under plan | 9,000 |  |  |  | 9,000 |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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