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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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