Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash Flows From Operating Activities:
Net income	$ 297.1	$ 1,063.9	$ 927.4
Reconciling adjustments:
Depreciation and amortization	144.4	141.3	135.9
Amortization of operating lease right of use assets	142.0	153.0	103.3
Deferred income taxes	19.6	90.2	33.2
Loss (Gain) on disposal of property and equipment	0.6	(1.5)	(0.8)
Share-based compensation expense	23.8	18.3	19.3
Income from SSAT	(2.2)	(83.1)	(56.3)
Distributions from SSAT		47.3	46.9
Other	(2.7)
Changes in assets and liabilities:
Accounts receivable, net	(10.9)	74.6	(90.3)
Deferred dry-docking payments	(24.1)	(25.7)	(36.3)
Deferred dry-docking amortization	25.3	24.9	24.3
Prepaid expenses and other assets	33.5	(45.2)	(48.1)
Accounts payable, accruals and other liabilities	10.9	(31.7)	39.6
Operating lease liabilities	(144.8)	(154.1)	(99.7)
Other long-term liabilities	(2.0)	(0.3)	(14.3)
Net cash provided by operating activities	510.5	1,271.9	984.1
Cash Flows From Investing Activities:
Capitalized vessel construction expenditures	(52.9)	(62.4)	(14.9)
Capital expenditures (excluding vessel construction expenditures)	(195.5)	(146.9)	(310.4)
Proceeds from disposal of property and equipment	1.2	1.2	1.9
Payments for intangible asset acquisitions	(12.4)	(3.0)
Cash and interest deposits into Capital Construction Fund	(128.5)	(582.8)	(31.2)
Withdrawals from Capital Construction Fund	49.9	64.6	31.2
Net cash used in investing activities	(338.2)	(729.3)	(323.4)
Cash Flows From Financing Activities:
Repayments of debt	(76.9)	(111.5)	(59.3)
Proceeds from revolving credit facility			304.3
Repayments of revolving credit facility			(376.1)
Payment of financing costs			(3.0)
Dividends paid	(45.0)	(48.0)	(45.9)
Repurchase of Matson common stock	(155.2)	(397.0)	(198.3)
Tax withholding related to net share settlements of restricted stock units	(12.6)	(20.1)	(14.4)
Net cash used in financing activities	(289.7)	(576.6)	(392.7)
Net (Decrease) Increase in Cash, Cash Equivalents and Restricted Cash	(117.4)	(34.0)	268.0
Cash, Cash Equivalents and Restricted Cash, Beginning of the Year	253.7	287.7	19.7
Cash, Cash Equivalents and Restricted Cash, End of the Year	136.3	253.7	287.7
Reconciliation of Cash, Cash Equivalents, and Restricted Cash, at End of the Year:
Cash and Cash Equivalents	134.0	249.8	282.4
Restricted Cash	2.3	3.9	5.3
Total Cash, Cash Equivalents and Restricted Cash, End of the Year	136.3	253.7	287.7
Supplemental Cash Flow Information:
Interest paid, net of capitalized interest	11.1	16.2	19.3
Income tax paid, net of income tax refunds	7.5	215.2	241.6
Non-cash Information:
Capital expenditures included in accounts payable, accruals and other liabilities	10.8	5.5	$ 6.4
Non-cash payments for intangible asset acquisitions	$ 2.7	$ 2.2