CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Operating Revenue:
Ocean transportation	$ 1,229.4	$ 1,189.8	$ 1,076.2
Logistics	407.8	370.2	386.4
Total operating revenue	1,637.2	1,560.0	1,462.6
Costs and Expenses:
Operating costs	1,402.3	1,338.1	1,280.1
Equity in loss (income) of terminal joint venture	2.0	(3.2)	(8.6)
Selling, general and administrative	132.6	119.8	112.5
Separation costs		8.6
Total costs and expenses	1,536.9	1,463.3	1,384.0
Operating Income	100.3	96.7	78.6
Interest expense	(14.4)	(11.7)	(7.7)
Income from Continuing Operations Before Income Taxes	85.9	85.0	70.9
Income tax expense	(32.2)	(33.0)	(25.1)
Income From Continuing Operations	53.7	52.0	45.8
Loss From Discontinued Operations (net of income taxes)	0	(6.1)	(11.6)
Net Income	53.7	45.9	34.2
Other Comprehensive Income (Loss), Net of Income Taxes:
Net Income	53.7	45.9	34.2
Other Comprehensive Income (Loss):
Net gain (loss) and prior service cost	18.7	(4.6)	(5.7)
Amortization of prior service cost included in net periodic pension cost	(1.3)	(1.4)	0.3
Amortization of net loss included in net periodic pension cost	4.7	4.8	3.9
Foreign currency translation adjustment	(0.1)
Other comprehensive income (loss) from discontinued operations		0.7	(8.4)
Total Other Comprehensive Income (Loss)	22.0	(0.5)	(9.9)
Comprehensive Income	$ 75.7	$ 45.4	$ 24.3
Basic Earnings (Loss) Per Share:
Continuing operations (in dollars per share)	$ 1.26	$ 1.23	$ 1.10
Discontinued operations (in dollars per share)		$ (0.14)	$ (0.28)
Basic Earnings Per Share (in dollars per share)	$ 1.26	$ 1.09	$ 0.82
Diluted Earnings (Loss) Per Share:
Continuing operations (in dollars per share)	$ 1.25	$ 1.22	$ 1.09
Discontinued operations (in dollars per share)		$ (0.14)	$ (0.28)
Diluted Earnings Per Share (in dollars per share)	$ 1.25	$ 1.08	$ 0.81
Weighted Average Number of Shares Outstanding:
Basic (in shares)	42.7	42.3	41.6
Diluted (in shares)	43.1	42.7	42.0