Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Cash Flows From Operating Activities:
Net income	$ 76.4	$ 43.0
Reconciling adjustments:
Depreciation and amortization	59.1	52.5
Deferred income taxes	31.9	(2.9)
Share-based compensation expense	9.6	5.6
Equity in income from terminal joint venture	(13.1)	(5.4)
Distribution from terminal joint venture	8.8
Other	1.4	(6.7)
Changes in assets and liabilities:
Accounts receivable	(11.6)	(10.2)
Deferred dry-docking payments	(14.0)	(12.5)
Deferred dry-docking amortization	16.8	16.0
Prepaid expenses and other assets	(15.2)	9.6
Accounts payable and accrued liabilities	(2.1)	5.8
Other liabilities	11.0	1.3
Net cash provided by operating activities	159.0	96.1
Cash Flows From Investing Activities:
Capital expenditures	(30.3)	(25.6)
Proceeds from disposal of property and equipment	4.7	3.6
Deposits into Capital Construction Fund	(77.9)	(31.9)
Withdrawals from Capital Construction Fund	93.7	4.4
Payments for Horizon's common stock, net of cash acquired, and other acquisitions	(29.0)
Net cash used in investing activities	(38.8)	(49.5)
Cash Flows From Financing Activities:
Proceeds from issuance of debt		100.0
Repayments of debt and capital lease obligations	(13.4)	(8.6)
Proceeds from revolving credit facility	557.0
Repayments of revolving credit facility	(439.0)
Payment of financing costs	(0.9)
Proceeds from issuance of capital stock	1.4	1.6
Tax withholding related to net share settlements of restricted stock units	(2.9)	(1.9)
Dividends paid	(22.8)	(21.3)
Payments of Horizon debt and redeemed warrants	(467.5)
Net cash (used in) provided by financing activities	(388.1)	69.8
Net (decrease) increase in cash and cash equivalents	(267.9)	116.4
Cash and cash equivalents, beginning of the period	293.4	114.5
Cash and cash equivalents, end of the period	25.5	230.9
Supplemental Cash Flow Information:
Interest paid	13.2	10.6
Income tax paid	34.2	22.1
Non-cash Information:
Capital expenditures included in accounts payable and accrued liabilities	6.1	$ 0.5
Capital lease obligations	$ 1.7