Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash Flows From Operating Activities:
Net income from continuing operations	$ 70.8	$ 53.7	$ 52.0
Reconciling adjustments:
Depreciation and amortization	69.7	69.7	72.5
Deferred income taxes	2.7us-gaap_DeferredIncomeTaxExpenseBenefit	57.5us-gaap_DeferredIncomeTaxExpenseBenefit	(8.8)us-gaap_DeferredIncomeTaxExpenseBenefit
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Post-retirement (income) expense	(5.9)	1.6	2.6
Share-based compensation expense	8.7us-gaap_ShareBasedCompensation	5.9us-gaap_ShareBasedCompensation	4.0us-gaap_ShareBasedCompensation
Equity in (income) loss of terminal joint venture	(6.6)	2.0	(3.2)
Impairment of intangible assets			2.1
Tax benefit from equity issuance	0.8matx_TaxBenefitFromEquityIssuance	1.8matx_TaxBenefitFromEquityIssuance
Excess tax benefit from stock-based compensation	(1.1)	(0.6)
Changes in assets and liabilities:
Accounts receivable	(15.3)	(7.6)	(7.0)
Deferred dry-docking payments	(14.1)	(14.0)	(44.8)
Deferred dry-docking amortization	21.1	22.0	23.3
Prepaid expenses and other assets	17.3	(11.8)	(10.4)
Accounts payable and accrued liabilities	13.5	2.2	(7.9)
Other liabilities	5.6	13.1	20.8
Net cash provided by operating activities from continuing operations	165.7	195.7	94.0
Cash Flows From Investing Activities:
Capital expenditures	(27.9)	(35.2)	(38.1)
Proceeds from disposal of property and equipment	4.9	4.5	6.8
Deposits into Capital Construction Fund	(31.9)us-gaap_IncreaseInRestrictedCash	(4.4)us-gaap_IncreaseInRestrictedCash	(4.4)us-gaap_IncreaseInRestrictedCash
Withdrawals from Capital Construction Fund	4.4us-gaap_DecreaseInRestrictedCash	4.4us-gaap_DecreaseInRestrictedCash	4.4us-gaap_DecreaseInRestrictedCash
Payments for acquisitions		(9.3)
Contribution from the Former Parent Company			25.0matx_DividendsReceivedFromFormerParent
Net cash used in investing activities from continuing operations	(50.5)	(40.0)	(6.3)
Cash Flows From Financing Activities:
Excess tax benefit from stock-based compensation	1.1	0.6
Proceeds from issuance of long-term debt	100.0	21.0	197.0
Payments of long-term debt	(11.4)us-gaap_RepaymentsOfLongTermDebt	(45.4)us-gaap_RepaymentsOfLongTermDebt	(80.4)us-gaap_RepaymentsOfLongTermDebt
(Payments) to/ proceeds from the line-of-credit agreements, net		(11.0)	5.0
Payment of financing costs			(1.9)us-gaap_PaymentsOfFinancingCosts
Payment of capital leases	(1.1)	(1.2)
Proceeds from issuance of capital stock	5.8	1.7	25.2
Tax withholding related to net share settlements of restricted stock units	(2.0)
Dividends paid	(28.7)us-gaap_PaymentsOfDividendsCommonStock	(26.8)us-gaap_PaymentsOfDividendsCommonStock	(39.5)us-gaap_PaymentsOfDividendsCommonStock
Contribution to A&B upon Separation			(155.7)
Cash assumed by A&B upon Separation			(2.5)us-gaap_CashAcquiredFromAcquisition
Distribution to Former Parent Company from issuance of capital stock			(21.7)
Net cash provided by (used in) financing activities from continuing operations	63.7	(61.1)	(74.5)
Cash Flows From Discontinued Operations:
Cash flows used in operating activities of discontinued operations			(29.9)
Cash flows used in investing activities of discontinued operations			(18.8)
Cash flows provided by financing activities of discontinued operations			33.9
Net cash flows used in discontinued operations			(14.8)
Net Increase (Decrease) in Cash and Cash Equivalents	178.9	94.6	(1.6)
Cash and cash equivalents, beginning of the year	114.5	19.9	21.5
Cash and cash equivalents, end of the year	293.4	114.5	19.9
Supplemental Cash Flow Information:
Interest paid	15.2us-gaap_InterestPaidNet	13.8us-gaap_InterestPaidNet	11.3us-gaap_InterestPaidNet
Income tax (refund) paid	30.2us-gaap_IncomeTaxesPaidNet	(3.4)us-gaap_IncomeTaxesPaidNet	42.7us-gaap_IncomeTaxesPaidNet
Non-cash Information:
Capital expenditures included in accounts payable and accrued liabilities	1.6	2.1	4.2
Capital lease obligations		$ 2.9

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Amount of cash inflow (outflow) of investing activities, excluding discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

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Amount of cash inflow (outflow) from operating activities, excluding discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.

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The cash outflow for loan and debt issuance costs.

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Amount of cash outflow to satisfy an employee's income tax withholding obligation as part of a net-share settlement of a share-based award.

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The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

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The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets.

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The amount of pension and other (such as medical, dental and life insurance) postretirement benefit costs recognized during the period for (1) defined benefit plans (periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss) on assets, prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments) and for (2) defined contribution plans (to the extent that a plan's defined contributions to an individual's account are to be made for periods in which that individual renders services, the net cost for a period is the contribution called for in that period; if a plan calls for contributions for periods after an individual retires or terminates, the estimated cost is accrued during the employee's service period).

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The cash inflow from the additional capital contribution to the entity.

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The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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The net cash inflow or outflow for borrowing having initial term of repayment within one year or the normal operating cycle, if longer.

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The cash inflow from the sale of property, plant and equipment (capital expenditures), software, and other intangible assets.

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The cash outflow for the obligation for a lease meeting the criteria for capitalization (with maturities exceeding one year or beyond the operating cycle of the entity, if longer).

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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