Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Cash Flows From Operating Activities:
Net income	$ 532.9	$ 107.5
Reconciling adjustments:
Depreciation and amortization	100.9	84.5
Amortization of operating lease right of use assets	73.9	53.1
Deferred income taxes	30.3	33.5
Share-based compensation expense	14.2	12.0
Income from SSAT	(35.0)	(15.4)
Distribution from SSAT	46.9	37.9
Other	(1.1)	0.5
Changes in assets and liabilities:
Accounts receivable, net	(75.2)	(28.9)
Deferred dry-docking payments	(25.8)	(11.1)
Deferred dry-docking amortization	18.0	17.8
Prepaid expenses and other assets	(46.7)	19.6
Accounts payable, accruals and other liabilities	30.2	24.0
Operating lease liabilities	(72.1)	(53.7)
Other long-term liabilities	(8.1)	(10.5)
Net cash provided by operating activities	583.3	270.8
Cash Flows From Investing Activities:
Capitalized vessel construction expenditures		(57.8)
Other capital expenditures	(244.7)	(53.5)
Proceeds from disposal of property and equipment	2.2	15.7
Cash deposits into Capital Construction Fund	(31.2)	(97.1)
Withdrawals from Capital Construction Fund	31.2	97.1
Net cash used in investing activities	(242.5)	(95.6)
Cash Flows From Financing Activities:
Proceeds from issuance of debt		325.5
Repayments of debt	(41.1)	(204.2)
Proceeds from revolving credit facility	304.3	547.4
Repayments of revolving credit facility	(376.1)	(803.5)
Payment of financing costs	(3.0)	(18.5)
Proceeds from issuance of capital stock		0.1
Dividends paid	(33.3)	(29.1)
Repurchase of Matson common stock	(115.7)
Tax withholding related to net share settlements of restricted stock units	(14.4)	(5.6)
Net cash used in financing activities	(279.3)	(187.9)
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash	61.5	(12.7)
Cash, Cash Equivalents and Restricted Cash, Beginning of the Period	19.7	28.4
Cash, Cash Equivalents and Restricted Cash, End of the Period	81.2	15.7
Reconciliation of Cash, Cash Equivalents, and Restricted Cash, at End of the Period:
Cash and Cash Equivalents	75.9	12.7
Restricted Cash	5.3	3.0
Total Cash, Cash Equivalents and Restricted Cash, End of the Period	81.2	15.7
Supplemental Cash Flow Information:
Interest paid, net of capitalized interest	15.3	22.4
Income tax payments and (refunds), net	162.1	(18.0)
Non-cash Information:
Capital expenditures included in accounts payable, accruals and other liabilities	$ 5.6	$ 5.9