Condensed Consolidated Statements of Income and Comprehensive Income - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Operating Revenue:
Ocean Transportation	$ 379.3	$ 370.0
Logistics	132.1	104.4
Total Operating Revenue	511.4	474.4
Costs and Expenses:
Operating costs	(439.3)	(411.8)
Equity in income of Terminal Joint Venture	10.5	4.9
Selling, general and administrative	(53.9)	(50.3)
Total Costs and Expenses	(482.7)	(457.2)
Operating Income	28.7	17.2
Interest expense	(5.0)	(6.3)
Other income (expense), net	0.8	(0.8)
Income before Income Taxes	24.5	10.1
Income taxes	(10.3)	(3.1)
Net Income	14.2	7.0
Other Comprehensive Income (Loss), Net of Income Taxes:
Net Income	14.2	7.0
Other Comprehensive Income (Loss):
Amortization of prior service cost included in net periodic pension cost	(1.3)	(0.4)
Amortization of net loss included in net periodic pension cost	1.3	0.9
Other adjustments	0.2	0.2
Total Other Comprehensive Income	0.2	0.7
Comprehensive Income	$ 14.4	$ 7.7
Basic Earnings Per-Share: (in dollars per share)	$ 0.33	$ 0.16
Diluted Earnings Per-Share: (in dollars per share)	$ 0.33	$ 0.16
Weighted Average Number of Shares Outstanding:
Basic (in shares)	42.6	43.0
Diluted (in shares)	42.9	43.4
Dividends
Cash Dividends Per-Share	$ 0.20	$ 0.19