Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Cash Flows From Operating Activities:
Net income	$ 36.1	$ 34.0
Reconciling adjustments:
Depreciation and amortization	37.6	35.8
Amortization of operating lease right of use assets	33.9	39.6
Deferred income taxes	2.3	(1.4)
Share-based compensation expense	5.7	4.6
(Income) loss from SSAT	(0.4)	1.8
Distributions from SSAT	14.0
Other	(2.1)	(0.1)
Changes in assets and liabilities:
Accounts receivable, net	(23.7)	(14.5)
Deferred dry-docking payments	(5.2)	(2.4)
Deferred dry-docking amortization	6.8	6.2
Prepaid expenses and other assets	2.4	45.7
Accounts payable, accruals and other liabilities	(34.3)	(8.4)
Operating lease liabilities	(34.6)	(39.4)
Other long-term liabilities	(1.9)	(4.8)
Net cash provided by operating activities	36.6	96.7
Cash Flows From Investing Activities:
Capitalized vessel construction expenditures	(1.1)	(0.4)
Capital expenditures (excluding vessel construction expenditures)	(54.2)	(35.5)
Proceeds from disposal of property and equipment, net	2.3	0.3
Payment for intangible asset acquisition		(12.4)
Cash and interest deposits into Capital Construction Fund, net	(6.0)	(105.5)
Net cash used in investing activities	(59.0)	(153.5)
Cash Flows From Financing Activities:
Repayments of debt	(10.1)	(40.8)
Dividends paid	(11.1)	(11.3)
Repurchase of Matson common stock	(47.3)	(40.0)
Tax withholding related to net share settlements of restricted stock units	(17.2)	(12.4)
Net cash used in financing activities	(85.7)	(104.5)
Net Decrease in Cash, Cash Equivalents and Restricted Cash	(108.1)	(161.3)
Cash, Cash Equivalents and Restricted Cash, Beginning of the Period	136.3	253.7
Cash, Cash Equivalents and Restricted Cash, End of the Period	28.2	92.4
Reconciliation of Cash, Cash Equivalents, and Restricted Cash, at End of the Year:
Cash and Cash Equivalents	25.9	88.5
Restricted Cash	2.3	3.9
Total Cash, Cash Equivalents and Restricted Cash, End of the Period	28.2	92.4
Supplemental Cash Flow Information:
Interest paid, net of capitalized interest	0.5	5.0
Income tax payments (refunds), net	1.1	(30.3)
Non-cash Information:
Capital expenditures included in accounts payable, accruals and other liabilities	$ 16.0	5.1
Non-cash payment for intangible asset acquisition		$ 4.1