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Segment Results (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Segment Reporting Information [Line Items]
Revenue	$ 394.2	$ 377.4	$ 760.3	$ 707.1
Interest expense	(1.9)	(1.9)	(3.9)	(3.8)
Income from Continuing Operations Before Income Taxes	30.6	27.3	34.7	32.1
Income tax expense	15.3	9.6	17.4	11.4
Income From Continuing Operations	15.3	17.7	17.3	20.7
Income (Loss) From Discontinued Operations (net of income taxes)	(7.5)	1.0	(6.1)	3.2
Net Income	7.8	18.7	11.2	23.9
Ocean transportation segment [Member]
Segment Reporting Information [Line Items]
Revenue	299.5	274.3	579.0	512.7
Operating Profit	31.2	27.1	37.0	32.3
Logistics services segment [Member]
Segment Reporting Information [Line Items]
Revenue	94.7	103.1	181.3	194.4
Operating Profit	1.3	2.1	1.6	3.6
Transportation Industry [Member]
Segment Reporting Information [Line Items]
Operating Profit	$ 32.5	$ 29.2	$ 38.6	$ 35.9

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The net result for the period of deducting operating expenses from operating revenues. Also includes non-operating income and expense for the segments.

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