SHARE-BASED COMPENSATION (Additional Stock Option Information) (Details) - Stock Options - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation
Intrinsic value of options exercised	$ 10.2	$ 6.2	$ 5.2
Cash received from the exercise of options	9.0	4.5	5.2
Fair value of shares vested	2.2	2.1	1.7
Employee Service Share-based Compensation, Tax Benefit from Exercise of Stock Options	2.6	$ 2.1	$ 1.9
Unrecognized compensation cost related to nonvested share-based compensation	$ 1.5
Unrecognized compensation cost, recognized over a weighted-average period	2 years 5 months 26 days

Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of tax benefit from exercise of stock options granted under share-based compensation arrangement.

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Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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