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STOCK-BASED COMPENSATION PLANS, Unrecognized Stock-Based Compensation Expense and Stock Option Exercises (Details) - Stock Options [Member] - USD ($) shares in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Unrecognized Stock-Based Compensation Expense and Stock Option Exercises [Abstract] |  |  |
Unrecognized stock-based compensation expense related to non-vested stock options | $ 5.1 |  |
Weighted average period for recognition of unrecognized compensation cost | 3 years 3 months 18 days |  |
Total fair value of stock options vested | $ 2.4 | $ 2.3 | $ 2.2
Proceeds from stock option exercises | 11.3 | 9.4 |
Related tax benefits from stock option exercises | $ 2.3 | $ 1.6 |
Shares issued in connection with stock option exercise (in shares) | 0.3 | 0.3 |
Total intrinsic value of options exercised | $ 11.6 | $ 8.4 | $ 7.6

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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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