Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash Flows From Operating Activities:
Net income	$ 65.1	$ 61.4
Reconciling adjustments:
Depreciation and amortization	74.3	71.8
Deferred income taxes	22.3	24.7
Share-based compensation expense	7.8	9.2
Equity in income of related party Terminal Joint Venture	(19.3)	(9.2)
Cash distribution received from Terminal Joint Venture	14.0
Other	2.1	2.1
Changes in assets and liabilities:
Accounts receivable, net	(24.3)	(4.8)
Deferred dry-docking payments	(45.1)	(43.7)
Deferred dry-docking amortization	35.7	27.8
Prepaid expenses and other assets	4.3	(27.1)
Accounts payable, accruals and other liabilities	14.5	(27.2)
Other long-term liabilities	(4.4)	2.5
Net cash provided by operating activities	147.0	87.5
Cash Flows From Investing Activities:
Vessel construction expenditures	(172.2)	(39.2)
Other capital expenditures	(43.3)	(67.3)
Proceeds from (payments for) disposal of property and equipment	(0.3)	2.2
Cash deposits into Capital Construction Fund	(64.6)	(123.4)
Cash withdrawals from Capital Construction Fund	95.8	12.5
Payments for membership interests in Span Alaska, net of cash acquired		(112.8)
Net cash used in investing activities	(184.6)	(328.0)
Cash Flows From Financing Activities:
Proceeds from issuance of debt		200.0
Repayments of debt and capital leases	(19.5)	(13.7)
Proceeds from revolving credit facility	341.0	1,275.0
Repayments of revolving credit facility	(221.0)	(1,080.0)
Payment of financing costs	(1.7)
Proceeds from issuance of capital stock	0.4	0.6
Dividends paid	(25.2)	(24.0)
Repurchase of Matson common stock	(18.4)	(37.8)
Payments of Span Alaska debt		(81.9)
Tax withholding related to net share settlements of restricted stock units	(7.2)	(6.8)
Net cash used in financing activities	48.4	231.4
Net Increase (Decrease) in Cash and Cash Equivalents	10.8	(9.1)
Cash and Cash Equivalents, Beginning of the Period	13.9	25.5
Cash and Cash Equivalents, End of the Period	24.7	16.4
Supplemental Cash Flow Information:
Interest paid, net of capitalized interest	20.5	15.7
Income tax paid (refund)	(0.1)	16.2
Non-cash Information:
Capital expenditures included in accounts payable, accruals and other liabilities	$ 1.5	$ 12.6