Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash Flows From Operating Activities:
Net income	$ 14.2	$ 7.0
Reconciling adjustments:
Depreciation and amortization	23.6	24.6
Deferred income taxes	6.4	2.9
Share-based compensation expense	2.7	2.6
Equity in income of Terminal Joint Venture	(10.5)	(4.9)
Distribution from Terminal Joint Venture	7.0
Other	(0.6)	(2.6)
Changes in assets and liabilities:
Accounts receivable, net	(14.5)	(8.4)
Deferred dry-docking payments	(4.6)	(15.1)
Deferred dry-docking amortization	9.2	11.5
Prepaid expenses and other assets	8.2	(1.1)
Accounts payable, accruals and other liabilities	(11.0)	(13.3)
Other long-term liabilities	(0.2)	0.8
Net cash provided by operating activities	29.9	4.0
Cash Flows From Investing Activities:
Capitalized vessel construction expenditures	(57.7)	(1.3)
Other capital expenditures	(13.1)	(22.9)
Proceeds from disposal of property and equipment	1.0
Cash deposits into Capital Construction Fund	(53.5)
Withdrawals from Capital Construction Fund	53.5
Net cash used in investing activities	(69.8)	(24.2)
Cash Flows From Financing Activities:
Repayments of debt and capital leases	(2.5)	(2.6)
Proceeds from revolving credit facility	117.4	100.0
Repayments of revolving credit facility	(68.4)	(56.0)
Proceeds from issuance of common stock	0.2	0.4
Dividends paid	(8.7)	(8.3)
Repurchase of Matson common stock		(0.7)
Tax withholding related to net share settlements of restricted stock units	(4.2)	(7.1)
Other		0.1
Net cash provided by financing activities	33.8	25.8
Net (Decrease) Increase in Cash and Cash Equivalents	(6.1)	5.6
Cash and Cash Equivalents, Beginning of the Period	19.8	13.9
Cash and Cash Equivalents, End of the Period	13.7	19.5
Supplemental Cash Flow Information:
Interest paid, net of capitalized interest	5.3	6.5
Income tax paid, net of income tax refunds	0.2	0.4
Non-cash Information:
Capital expenditures included in accounts payable, accruals and other liabilities	$ 0.7	$ 2.4