Condensed Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Current Assets:
Cash and cash equivalents	$ 325.8	$ 293.4
Accounts receivable, net	201.8	197.6
Deferred income taxes	7.8	8.0
Prepaid expenses and other assets	19.6	20.5
Total current assets	555.0	519.5
Investment in terminal joint venture	67.8	64.4
Property and equipment, net	678.7	691.2
Goodwill and intangible assets, net	29.8	29.9
Capital Construction Fund deposits	27.5	27.5
Other long-term assets	68.1	69.3
Total assets	1,426.9	1,401.8
Current Liabilities:
Current portion of debt	21.6	21.6
Accounts payable	140.6	133.2
Payroll and vacation benefits	15.9	17.3
Uninsured liabilities	25.0	24.5
Accrued and other liabilities	20.7	26.9
Total current liabilities	223.8	223.5
Long-term Liabilities:
Long-term debt	349.6	352.0
Deferred income taxes	313.3	308.4
Employee benefit plans	119.2	118.6
Uninsured and other liabilities	35.7	35.5
Total long-term liabilities	817.8	814.5
Commitments and Contingencies (Note 7)
Shareholders' Equity:
Capital stock	32.4	32.4
Additional paid in capital	278.0	274.9
Accumulated other comprehensive loss	(52.4)	(53.3)
Retained earnings	127.3	109.8
Total shareholders' equity	385.3	363.8
Total liabilities and shareholders' equity	$ 1,426.9	$ 1,401.8