Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Cash Flows From Operating Activities:
Net income	$ 36.1	$ 34.9
Reconciling adjustments:
Depreciation and amortization	47.6	35.6
Deferred income taxes	7.4	20.7
Share-based compensation expense	6.2	7.6
Equity in income of related party Terminal Joint Venture	(5.6)	(8.6)
Distributions from Terminal Joint Venture		3.5
Other	1.1	3.0
Changes in assets and liabilities:
Accounts receivable	7.9	5.8
Deferred dry-docking payments	(28.5)	(12.3)
Deferred dry-docking amortization	17.2	11.1
Prepaid expenses and other assets	7.3	(12.6)
Accounts payable and accrued liabilities	11.2	(1.9)
Other liabilities	(29.1)	16.1
Net cash provided by operating activities	78.8	102.9
Cash Flows From Investing Activities:
Capital expenditures	(65.8)	(12.2)
Proceeds from disposal of property and equipment	1.7	1.6
Cash deposits into Capital Construction Fund	(12.5)	(2.2)
Withdrawals from Capital Construction Fund	12.5	2.2
Payments for Horizon's common stock, net of cash acquired, and other acquisitions		(28.7)
Net cash used in investing activities	(64.1)	(39.3)
Cash Flows From Financing Activities:
Excess tax benefit from stock-based compensation	0.1
Repayments of debt and capital leases	(11.1)	(33.4)
Proceeds from revolving credit facility	159.0	175.0
Repayments of revolving credit facility	(115.0)
Payments of Horizon debt and redemption of warrants		(467.5)
Proceeds from issuance of capital stock	0.4	2.5
Tax withholding related to net share settlements of restricted stock units	(6.3)	(2.9)
Dividends paid	(15.8)	(14.9)
Payments for shares repurchased	(32.3)
Net cash used in financing activities	(21.0)	(341.2)
Net Decrease in Cash and Cash Equivalents	(6.3)	(277.6)
Cash and cash equivalents, beginning of the period	25.5	293.4
Cash and cash equivalents, end of the period	19.2	15.8
Supplemental Cash Flow Information:
Interest paid	11.6	8.6
Income tax paid	5.4	27.0
Non-cash Information:
Capital expenditures included in accounts payable and accrued liabilities	4.9	2.9
Accrued dividend	$ 8.2	$ 7.9