Condensed Consolidated Statements of Income and Comprehensive Income (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Operating Revenue:
Ocean transportation	$ 294.6	$ 299.9
Logistics	97.9	94.8
Total operating revenue	392.5	394.7
Costs and Expenses:
Operating costs	347.8	342.8
Equity in income from terminal joint venture	(0.2)	(0.2)
Selling, general and administrative	35.0	33.4
Total costs and expenses	382.6	376.0
Operating Income	9.9	18.7
Interest expense	(4.1)	(3.7)
Income before income taxes	5.8	15.0
Income tax expense	(2.4)	(5.9)
Net Income	3.4	9.1
Other Comprehensive Income (Loss), Net of Income Taxes:
Net Income	3.4	9.1
Other Comprehensive Income (Loss):
Amortization of prior service cost included in net periodic pension cost	(0.3)	(0.3)
Amortization of net loss included in net periodic pension cost	0.7	1.4
Foreign currency translation adjustment	(0.1)	0.2
Total Other Comprehensive Income	0.3	1.3
Comprehensive Income	$ 3.7	$ 10.4
Basic Earnings Per Share (in dollars per share)	$ 0.08	$ 0.21
Diluted Earnings Per Share (in dollars per share)	$ 0.08	$ 0.21
Weighted Average Number of Shares Outstanding:
Basic (in shares)	42.9	42.6
Diluted (in shares)	43.3	43.0