Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Cash Flows From Operating Activities:
Net income	$ 234.7	$ 985.9
Reconciling adjustments:
Depreciation and amortization	108.1	105.6
Amortization of operating lease right of use assets	108.2	113.9
Deferred income taxes	(9.3)	146.3
Share-based compensation expense	17.6	15.5
Loss (income) from SSAT	1.9	(82.1)
Distributions from SSAT		40.3
Other	(1.7)	(0.2)
Changes in assets and liabilities:
Accounts receivable, net	(37.1)	13.9
Deferred dry-docking payments	(17.3)	(16.7)
Deferred dry-docking amortization	18.6	18.6
Prepaid expenses and other assets	65.8	(110.2)
Accounts payable, accruals and other liabilities	34.4	(5.0)
Operating lease liabilities	(109.9)	(113.8)
Other long-term liabilities	(14.9)	(9.5)
Net cash provided by operating activities	399.1	1,102.5
Cash Flows From Investing Activities:
Capitalized vessel construction expenditures	(52.1)	(11.9)
Other capital expenditures	(135.4)	(113.4)
Proceeds from disposal of property and equipment	0.1	0.4
Payment for intangible asset acquisition	(12.4)	(3.0)
Cash deposits and interest into the Capital Construction Fund	(120.8)	(579.7)
Withdrawals from Capital Construction Fund	49.9	14.7
Net cash used in investing activities	(270.7)	(692.9)
Cash Flows From Financing Activities:
Repayments of debt	(67.2)	(97.2)
Dividends paid	(33.8)	(36.9)
Repurchase of Matson common stock	(108.2)	(296.9)
Tax withholding related to net share settlements of restricted stock units	(12.5)	(19.6)
Net cash used in financing activities	(221.7)	(450.6)
Net Decrease in Cash, Cash Equivalents and Restricted Cash	(93.3)	(41.0)
Cash, Cash Equivalents and Restricted Cash, Beginning of the Period	253.7	287.7
Cash, Cash Equivalents and Restricted Cash, End of the Period	160.4	246.7
Reconciliation of Cash, Cash Equivalents, and Restricted Cash, at End of the Period:
Cash and Cash Equivalents	156.5	242.8
Restricted Cash	3.9	3.9
Total Cash, Cash Equivalents and Restricted Cash, End of the Period	160.4	246.7
Supplemental Cash Flow Information:
Interest paid, net of capitalized interest (including debt prepaid fees)	9.6	13.6
Income tax payments (refunds), net	(5.3)	212.4
Non-cash Information:
Capital expenditures included in accounts payable, accruals and other liabilities	7.8	3.9
Non-cash payment for intangible asset acquisition	$ 4.1	$ 2.2