Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Cash Flows From Operating Activities:
Net income	$ 34.9	$ 21.5
Reconciling adjustments:
Depreciation and amortization	35.6	35.2
Deferred income taxes	20.7	3.6
Share-based compensation expense	7.6	3.7
Equity in income of terminal joint venture	(8.6)	(2.3)
Distribution from terminal joint venture	3.5
Other	3.0	(1.5)
Changes in assets and liabilities:
Accounts receivable	5.8	(14.4)
Deferred dry-docking payments	(12.3)	(11.8)
Deferred dry-docking amortization	11.1	10.6
Prepaid expenses and other assets	(12.6)	(7.0)
Accounts payable and accrued liabilities	(1.9)	7.0
Other liabilities	16.1	4.6
Net cash provided by operating activities	102.9	49.2
Cash Flows From Investing Activities:
Capital expenditures	(12.2)	(20.2)
Proceeds from disposal of property and equipment	1.6	1.2
Deposits into Capital Construction Fund	(2.2)	(2.2)
Withdrawals from Capital Construction Fund	2.2	2.2
Payments for Horizon's common stock, net of cash acquired	(28.7)
Net cash used in investing activities	(39.3)	(19.0)
Cash Flows From Financing Activities:
Proceeds from issuance of debt	175.0	100.0
Payments of Horizon debt and redeemed warrants	(467.5)
Payments of other debt	(33.4)	(6.2)
Proceeds from issuance of capital stock	2.5	0.8
Tax withholding related to net share settlements of restricted stock units	(2.9)	(1.7)
Dividends paid	(14.9)	(13.9)
Net cash (used in) provided by financing activities	(341.2)	79.0
Net (decrease) increase in cash and cash equivalents	(277.6)	109.2
Cash and cash equivalents, beginning of the period	293.4	114.5
Cash and cash equivalents, end of the period	15.8	223.7
Supplemental Cash Flow Information:
Interest paid	8.6	6.6
Income tax paid	27.0	12.7
Non-cash Information:
Capital expenditures included in accounts payable and accrued liabilities	2.9	2.1
Accrued dividend	$ 7.9	$ 7.4