Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Cash Flows From Operating Activities:
Net income	$ 34.0	$ 339.2
Reconciling adjustments:
Depreciation and amortization	35.8	35.6
Amortization of operating lease right of use assets	39.6	36.2
Deferred income taxes	(1.4)	6.6
Share-based compensation expense	4.6	4.7
Loss (income) from SSAT	1.8	(34.0)
Other	(0.1)	(0.2)
Changes in assets and liabilities:
Accounts receivable, net	(14.5)	(27.7)
Deferred dry-docking payments	(2.4)	(8.6)
Deferred dry-docking amortization	6.2	6.7
Prepaid expenses and other assets	45.7	(31.5)
Accounts payable, accruals and other liabilities	(8.4)	(16.2)
Operating lease liabilities	(39.4)	(35.4)
Other long-term liabilities	(4.8)	(1.5)
Net cash provided by operating activities	96.7	273.9
Cash Flows From Investing Activities:
Capitalized vessel construction expenditures	(0.4)	(9.4)
Other capital expenditures	(35.5)	(37.4)
Proceeds from disposal of property and equipment	0.3	0.4
Payment for asset acquisition	(12.4)
Cash deposits and interest into the Capital Construction Fund	(105.5)	(10.7)
Withdrawals from Capital Construction Fund		10.7
Net cash used in investing activities	(153.5)	(46.4)
Cash Flows From Financing Activities:
Repayments of debt	(40.8)	(14.4)
Dividends paid	(11.3)	(12.9)
Repurchase of Matson common stock	(40.0)	(70.4)
Tax withholding related to net share settlements of restricted stock units	(12.4)	(19.4)
Net cash used in financing activities	(104.5)	(117.1)
Net (Decrease) Increase in Cash, Cash Equivalents and Restricted Cash	(161.3)	110.4
Cash, Cash Equivalents and Restricted Cash, Beginning of the Period	253.7	287.7
Cash, Cash Equivalents and Restricted Cash, End of the Period	92.4	398.1
Reconciliation of Cash, Cash Equivalents, and Restricted Cash, at End of the Period:
Cash and Cash Equivalents	88.5	392.8
Restricted Cash	3.9	5.3
Total Cash, Cash Equivalents and Restricted Cash, End of the Period	92.4	398.1
Supplemental Cash Flow Information:
Interest paid, net of capitalized interest (including debt prepaid fees)	5.0	4.5
Income tax payments (refunds), net	(30.3)	103.1
Non-cash Information:
Capital expenditures included in accounts payable, accruals and other liabilities	5.1	$ 7.1
Non-cash payment for asset acquisition	$ 4.1