Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cash Flows From Operating Activities:
Net income	$ 36.6	$ 30.9
Reconciling adjustments:
Depreciation and amortization	55.6	47.5
Amortization of operating lease right of use assets	35.6	33.5
Deferred income taxes	11.4	9.9
Share-based compensation expense	6.1	6.2
Income from SSAT	(7.7)	(9.4)
Distribution from SSAT	7.8	9.5
Other	0.5	(1.6)
Changes in assets and liabilities:
Accounts receivable, net	(9.3)	10.8
Deferred dry-docking payments	(7.6)	(6.9)
Deferred dry-docking amortization	11.8	17.2
Prepaid expenses and other assets	25.2	25.5
Accounts payable, accruals and other liabilities	14.0	(29.6)
Operating lease liabilities	(36.0)	(33.3)
Other long-term liabilities	(3.4)	(2.0)
Net cash provided by operating activities	140.6	108.2
Cash Flows From Investing Activities:
Capitalized vessel construction expenditures	(16.5)	(30.6)
Other capital expenditures	(34.0)	(38.4)
Proceeds from disposal of property and equipment	15.4	2.2
Cash deposits into Capital Construction Fund	(97.1)	(26.4)
Withdrawals from Capital Construction Fund	97.1	26.4
Net cash used in investing activities	(35.1)	(66.8)
Cash Flows From Financing Activities:
Proceeds from issuance of debt	325.5
Repayments of debt	(192.8)	(11.8)
Proceeds from revolving credit facility	411.5	212.8
Repayments of revolving credit facility	(612.6)	(212.8)
Payment of financing costs	(18.5)
Proceeds from issuance of capital stock	0.1
Dividends paid	(19.1)	(18.2)
Tax withholding related to net share settlements of restricted stock units	(5.5)	(3.2)
Net cash used in financing activities	(111.4)	(33.2)
Net (Decrease) Increase in Cash, Cash Equivalents and Restricted Cash	(5.9)	8.2
Cash, Cash Equivalents and Restricted Cash, Beginning of the Period	28.4	24.5
Cash, Cash Equivalents and Restricted Cash, End of the Period	22.5	32.7
Reconciliation of Cash, Cash Equivalents and Restricted Cash, End of the Period:
Cash and Cash Equivalents	19.5	24.0
Restricted Cash	3.0	8.7
Cash, Cash Equivalents and Restricted Cash, End of the Period	22.5	32.7
Supplemental Cash Flow Information:
Interest paid, net of capitalized interest	17.9	7.8
Income tax (refunds) payments, net	(21.0)	(26.2)
Non-cash Information:
Capital expenditures included in accounts payable, accruals and other liabilities	4.6	3.7
Accrued dividends	$ 10.0	$ 9.4