Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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SHARE-BASED COMPENSATION (Stock/Stock Unit Award Activity) (Details) - Stock and Stock Unit Awards - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Stock/Stock Unit Award Activity and Related Information, Shares
Non-vested at beginning of period, shares	498
Awarded, shares	139
Vested, shares	(153)
Forfeited, shares	(21)
Non-vested at end of period, shares	463	498
Stock/Stock Unit Award Activity and Related Information, Weighted Average Grant Date Fair Value
Non-vested at beginning of period, weighted-average grant date fair value (in dollars per share)	$ 37.27
Awarded, weighted-average grant date fair value (in dollars per share)	51.47	$ 40.48	$ 42.23
Vested, weighted-average grant date fair value (in dollars per share)	34.33
Forfeited, weighted-average grant date fair value (in dollars per share)	40.32
Non-vested at the end of period, weighted-average grant date fair value (in dollars per share)	$ 42.36	$ 37.27
Unrecognized compensation cost related to nonvested share-based compensation	$ 7.6
Unrecognized compensation cost, recognized over a weighted-average period	1 year 4 months 24 days
Minimum
Share-based Compensation
Cliff vesting term	3 years
Maximum
Share-based Compensation
Cliff vesting term	4 years