Condensed Consolidated Statements of Income and Comprehensive Income (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Operating Revenue:
Ocean transportation	$ 305.5matx_OceanTransportation	$ 294.6matx_OceanTransportation
Logistics	92.7matx_LogisticsServices	97.9matx_LogisticsServices
Total Operating Revenue	398.2us-gaap_SalesRevenueNet	392.5us-gaap_SalesRevenueNet
Costs and Expenses:
Operating costs	318.2us-gaap_OperatingCostsAndExpenses	347.8us-gaap_OperatingCostsAndExpenses
Equity in income of terminal joint venture	(3.4)	(0.2)
Selling, general and administrative	38.5	35.0
Total Costs and Expenses	353.3us-gaap_CostsAndExpenses	382.6us-gaap_CostsAndExpenses
Operating Income	44.9us-gaap_OperatingIncomeLoss	9.9us-gaap_OperatingIncomeLoss
Interest expense	(4.3)us-gaap_InterestExpense	(4.1)us-gaap_InterestExpense
Income before income taxes	40.6	5.8
Income tax expense	(15.6)us-gaap_IncomeTaxExpenseBenefit	(2.4)us-gaap_IncomeTaxExpenseBenefit
Net Income	25.0	3.4
Net Income	25.0us-gaap_NetIncomeLoss	3.4us-gaap_NetIncomeLoss
Other Comprehensive Income (Loss), Net of Income Taxes:
Net Income	25.0us-gaap_NetIncomeLoss	3.4us-gaap_NetIncomeLoss
Other Comprehensive Income (Loss):
Net loss in prior service cost	(0.2)
Amortization of prior service cost included in net periodic pension cost	(0.4)	(0.3)
Amortization of net loss included in net periodic pension cost	1.4	0.7
Foreign currency translation adjustment	0.1	(0.1)
Total Other Comprehensive Income	0.9	0.3
Comprehensive Income	$ 25.9	$ 3.7
Basic Earnings Per Share:
Earnings Per Share, Basic	$ 0.58us-gaap_EarningsPerShareBasic	$ 0.08us-gaap_EarningsPerShareBasic
Diluted Earnings Per Share:
Earnings Per Share, Diluted	$ 0.57us-gaap_EarningsPerShareDiluted	$ 0.08us-gaap_EarningsPerShareDiluted
Weighted Average Number of Shares Outstanding:
Basic (in shares)	43.4	42.9
Diluted (in shares)	43.9	43.3
Dividends:
Cash dividends declared per share (in dollars per share)	$ 0.17	$ 0.16

This element represents revenue from rail intermodal, highway brokerage and warehousing.

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