SHARE-BASED AWARDS (Details 3) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based expense (net of estimated forfeitures)
Total share-based expense	$ 8.7	$ 5.9	$ 4.0
Total recognized tax benefit	(3.4)	(2.2)	(1.6)
Total share-based expense (net of tax)	5.3	3.7	2.4
Cash received by Matson upon option exercise	5.8	1.7	3.5
Intrinsic value of options exercised	3.4	1.1	5.2
Tax benefit realized upon option exercise	1.9	1.7	1.5
Fair value of stock vested	5.0	4.4	3.8
Stock options
Share-based expense (net of estimated forfeitures)
Total share-based expense	0.3	0.4	0.9
Total recognized tax benefit	(0.8)	(0.6)
Non-vested stock and restricted stock units
Share-based expense (net of estimated forfeitures)
Total share-based expense	8.4	5.5	3.1
Unrecognized compensation cost	$ 9.0
Unrecognized compensation cost, weighted average period for recognition	1 year 8 months 12 days

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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.

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The amount of expense, net of income tax, 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.

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No definition available.

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Aggregate proceeds received by the entity during the annual period from exercises of stock or unit options and conversion of similar instruments granted under equity-based payment arrangements.

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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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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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Disclosure of the aggregate tax benefit realized from the exercise of stock options and the conversion of similar instruments during the annual period.

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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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