Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Cash Flows From Operating Activities:
Net income	$ 114.8	$ 719.9
Reconciling adjustments:
Depreciation and amortization	72.1	71.1
Amortization of operating lease right of use assets	75.7	75.3
Deferred income taxes	(3.0)	9.4
Share-based compensation expense	9.8	10.5
Loss (income) from SSAT	3.2	(58.7)
Distributions from SSAT		26.3
Other	(1.7)	(0.7)
Changes in assets and liabilities:
Accounts receivable, net	(16.8)	(37.6)
Deferred dry-docking payments	(8.9)	(14.7)
Deferred dry-docking amortization	12.4	12.9
Prepaid expenses and other assets	68.3	(48.3)
Accounts payable, accruals and other liabilities	3.6	4.5
Operating lease liabilities	(76.3)	(74.2)
Other long-term liabilities	(6.7)	(4.6)
Net cash provided by operating activities	246.5	691.1
Cash Flows From Investing Activities:
Capitalized vessel construction expenditures	(50.8)	(11.4)
Other capital expenditures	(75.5)	(68.4)
Proceeds from disposal of property and equipment	0.1	0.8
Payment for intangible asset acquisition	(12.4)
Cash deposits and interest into the Capital Construction Fund	(113.1)	(10.7)
Withdrawals from Capital Construction Fund	49.9	10.7
Net cash used in investing activities	(201.8)	(79.0)
Cash Flows From Financing Activities:
Repayments of debt	(55.1)	(32.5)
Dividends paid	(22.4)	(25.0)
Repurchase of Matson common stock	(82.5)	(208.5)
Tax withholding related to net share settlements of restricted stock units	(12.5)	(19.5)
Net cash used in financing activities	(172.5)	(285.5)
Net (Decrease) Increase in Cash, Cash Equivalents and Restricted Cash	(127.8)	326.6
Cash, Cash Equivalents and Restricted Cash, Beginning of the Period	253.7	287.7
Cash, Cash Equivalents and Restricted Cash, End of the Period	125.9	614.3
Reconciliation of Cash, Cash Equivalents, and Restricted Cash, at End of the Period:
Cash and Cash Equivalents	122.0	609.0
Restricted Cash	3.9	5.3
Total Cash, Cash Equivalents and Restricted Cash, End of the Period	125.9	614.3
Supplemental Cash Flow Information:
Interest paid, net of capitalized interest (including debt prepaid fees)	7.1	8.4
Income tax payments (refunds), net	(28.8)	211.7
Non-cash Information:
Capital expenditures included in accounts payable, accruals and other liabilities	8.4	6.1
Non-cash payment for intangible asset acquisition	4.1
Accrued dividends	$ 11.2	$ 12.4