Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Cash Flows From Operating Activities:
Net income	$ 149.3	$ 114.8
Reconciling adjustments:
Depreciation and amortization	76.4	72.1
Amortization of operating lease right of use assets	68.1	75.7
Deferred income taxes	7.5	(3.0)
Share-based compensation expense	12.0	9.8
(Income) loss from SSAT	(1.6)	3.2
Distributions from SSAT	14.0
Other	(6.5)	(1.7)
Changes in assets and liabilities:
Accounts receivable, net	(28.9)	(16.8)
Deferred dry-docking payments	(17.3)	(8.9)
Deferred dry-docking amortization	13.7	12.4
Prepaid expenses and other assets	114.6	68.3
Accounts payable, accruals and other liabilities	17.4	3.6
Operating lease liabilities	(69.0)	(76.3)
Other long-term liabilities	(5.2)	(6.7)
Net cash provided by operating activities	344.5	246.5
Cash Flows From Investing Activities:
Capitalized vessel construction expenditures	(38.2)	(50.8)
Capital expenditures (excluding vessel construction expenditures)	(86.9)	(75.5)
Proceeds from disposal of property and equipment, net	3.2	0.1
Payment for intangible asset acquisition		(12.4)
Cash deposits and interest into the Capital Construction Fund, net	(45.0)	(113.1)
Withdrawals from Capital Construction Fund, net	35.8	49.9
Net cash used in investing activities	(131.1)	(201.8)
Cash Flows From Financing Activities:
Repayments of debt	(19.9)	(55.1)
Dividends paid	(22.1)	(22.4)
Repurchase of Matson common stock	(120.1)	(82.5)
Tax withholding related to net share settlements of restricted stock units	(17.0)	(12.5)
Net cash used in financing activities	(179.1)	(172.5)
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash	34.3	(127.8)
Cash and Cash Equivalents, and Restricted Cash, Beginning of the Period	136.3	253.7
Cash and Cash Equivalents, and Restricted Cash, End of the Period	170.6	125.9
Reconciliation of Cash, Cash Equivalents and Restricted Cash, End of the Period:
Cash and Cash Equivalents	168.2	122.0
Restricted Cash	2.4	3.9
Total Cash and Cash Equivalents, and Restricted Cash, End of the Period	170.6	125.9
Supplemental Cash Flow Information:
Interest paid, net of capitalized interest	3.5	7.1
Income tax payments (refunds), net	(114.3)	(28.8)
Non-cash Information:
Capital expenditures included in accounts payable, accruals and other liabilities	15.3	8.4
Non-cash payment for intangible asset acquisition		4.1
Accrued dividends	$ 11.4	$ 11.2