CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) shares in Millions, $ in Millions	Common Stock	Additional Paid In Capital	Accumulated Other Comprehensive Income (Loss)	Retained Earnings	Total
Balance at the beginning of the period at Dec. 31, 2022	$ 27.2	$ 290.4	$ (6.9)	$ 1,986.2	$ 2,296.9
Balance (in shares) at Dec. 31, 2022	36.3
Increase (Decrease) in Shareholders' Equity
Net Income				297.1	297.1
Other comprehensive income (loss), net of tax			(1.3)		(1.3)
Share-based compensation		23.8			23.8
Shares issued, net of shares withheld for employee taxes	$ 0.2	(12.7)		(0.1)	(12.6)
Shares issued, net of shares withheld for employee taxes (in shares)	0.2
Repurchase of Matson common stock	$ (1.6)	(8.1)		(148.5)	(158.2)
Repurchase of Matson common stock (in shares)	(2.1)
Dividends				(45.0)	(45.0)
Balance at the end of the period at Dec. 31, 2023	$ 25.8	293.4	(8.2)	2,089.7	2,400.7
Balance (in shares) at Dec. 31, 2023	34.4
Increase (Decrease) in Shareholders' Equity
Net Income				476.4	476.4
Other comprehensive income (loss), net of tax			1.7		1.7
Share-based compensation		26.5			26.5
Shares issued, net of shares withheld for employee taxes	$ 0.1	(17.7)			(17.6)
Shares issued, net of shares withheld for employee taxes (in shares)	0.2
Repurchase of Matson common stock	$ (1.2)	(5.5)		(194.3)	(201.0)
Repurchase of Matson common stock (in shares)	(1.6)
Equity interest in SSAT (see Note 4)				10.1	10.1
Dividends				(44.8)	(44.8)
Balance at the end of the period at Dec. 31, 2024	$ 24.7	296.7	(6.5)	2,337.1	$ 2,652.0
Balance (in shares) at Dec. 31, 2024	33.0				33.0
Increase (Decrease) in Shareholders' Equity
Net Income				444.8	$ 444.8
Other comprehensive income (loss), net of tax			8.1		8.1
Share-based compensation		22.7			22.7
Shares issued, net of shares withheld for employee taxes	$ 0.1	(16.4)			(16.3)
Shares issued, net of shares withheld for employee taxes (in shares)	0.1
Repurchase of Matson common stock	$ (2.0)	(7.8)		(297.6)	(307.4)
Repurchase of Matson common stock (in shares)	(2.7)
Dividends				(44.9)	(44.9)
Balance at the end of the period at Dec. 31, 2025	$ 22.8	$ 295.2	$ 1.6	$ 2,439.4	$ 2,759.0
Balance (in shares) at Dec. 31, 2025	30.4				30.4