Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash Flows From Operating Activities:
Net income	$ 1,063.9	$ 927.4	$ 193.1
Reconciling adjustments:
Depreciation and amortization	141.3	135.9	114.9
Amortization of operating lease right of use assets	153.0	103.3	74.8
Deferred income taxes	90.2	33.2	52.1
(Gain) Loss on disposal of property and equipment	(1.5)	(0.8)	2.8
Share-based compensation expense	18.3	19.3	18.8
Income from SSAT	(83.1)	(56.3)	(26.3)
Distributions from SSAT	47.3	46.9	55.4
Changes in assets and liabilities:
Accounts receivable, net	74.6	(90.3)	(48.0)
Deferred dry-docking payments	(25.7)	(36.3)	(16.8)
Deferred dry-docking amortization	24.9	24.3	25.1
Prepaid expenses and other assets	(45.2)	(48.1)	21.9
Accounts payable, accruals and other liabilities	(31.7)	39.6	44.8
Operating lease liabilities	(154.1)	(99.7)	(75.9)
Other long-term liabilities	(0.3)	(14.3)	(6.9)
Net cash provided by operating activities	1,271.9	984.1	429.8
Cash Flows From Investing Activities:
Capitalized vessel construction expenditures	(62.4)	(14.9)	(87.8)
Other capital expenditures	(146.9)	(310.4)	(104.5)
Proceeds from disposal of property and equipment, and other	(1.8)	1.9	15.3
Cash and interest deposits into Capital Construction Fund	(582.8)	(31.2)	(132.4)
Withdrawals from Capital Construction Fund	64.6	31.2	132.4
Net cash used in investing activities	(729.3)	(323.4)	(177.0)
Cash Flows From Financing Activities:
Proceeds from issuance of debt			325.5
Repayments of debt	(111.5)	(59.3)	(216.5)
Proceeds from revolving credit facility		304.3	648.0
Repayments of revolving credit facility		(376.1)	(955.3)
Payment of financing costs		(3.0)	(18.5)
Proceeds from issuance of capital stock			0.1
Dividends paid	(48.0)	(45.9)	(39.2)
Repurchase of Matson common stock	(397.0)	(198.3)
Tax withholding related to net share settlements of restricted stock units	(20.1)	(14.4)	(5.6)
Net cash used in financing activities	(576.6)	(392.7)	(261.5)
Net (Decrease) Increase in Cash, Cash Equivalents and Restricted Cash	(34.0)	268.0	(8.7)
Cash, Cash Equivalents and Restricted Cash, Beginning of the Year	287.7	19.7	28.4
Cash, Cash Equivalents and Restricted Cash, End of the Year	253.7	287.7	19.7
Reconciliation of Cash, Cash Equivalents, and Restricted Cash, at End of the Year:
Cash and Cash Equivalents	249.8	282.4	14.4
Restricted Cash	3.9	5.3	5.3
Total Cash, Cash Equivalents and Restricted Cash, End of the Year	253.7	287.7	19.7
Supplemental Cash Flow Information:
Income tax paid, net of income tax refunds	16.2	19.3	26.2
Income tax payments, net of refunds	215.2	241.6	(16.1)
Non-cash Information:
Capital expenditures included in accounts payable, accruals and other liabilities	$ 5.5	$ 6.4	$ 24.7