Condensed Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Cash Flows Provided by Operating Activities:
Net income	$ 43.0	$ 46.4
Reconciling adjustments:
Depreciation and amortization	52.5	52.1
Deferred income taxes	(2.9)	43.9
Share-based compensation expense	5.6	4.3
Equity in (income) loss of terminal joint venture	(5.4)	3.0
Other	(6.7)	1.2
Changes in assets and liabilities:
Accounts receivable	(10.2)	3.7
Deferred dry-docking payments	(12.5)	(10.6)
Deferred dry-docking amortization	16.0	17.1
Prepaid expenses and other assets	9.6	(23.8)
Accounts payable and accrued liabilities	5.8	4.8
Other liabilities	1.3	(4.3)
Net cash provided by operating activities	96.1	137.8
Cash Flows Used in Investing Activities:
Capital expenditures	(25.6)	(19.7)
Proceeds from disposal of property and equipment	3.6	4.0
Deposits into Capital Construction Fund	(31.9)	(4.4)
Withdrawals from Capital Construction Fund	4.4	4.4
Payments for acquisitions		(9.3)
Net cash used in investing activities	(49.5)	(25.0)
Cash Flows Used in Financing Activities:
Proceeds from issuance of debt	100.0	21.0
Repayments of Debt	(8.6)	(53.7)
Proceeds from issuance of capital stock	1.6	3.2
Tax Withholding related to net share settlements of restricted stock units	(1.9)	(1.5)
Dividends paid	(21.3)	(19.9)
Net cash provided by (used in) financing activities	69.8	(50.9)
Net increase in cash and cash equivalents	116.4	61.9
Cash and cash equivalents, beginning of the year	114.5	19.9
Cash and cash equivalents, end of the year	230.9	81.8
Supplemental Cash Flow Information:
Interest paid	10.6	8.9
Income tax paid	22.1	8.9
Non-cash Information:
Capital expenditures included in accounts payable and accrued liabilities	0.5	3.0
Capital lease obligations		$ 2.9