Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash Flows From Operating Activities:
Net income	$ 87.2	$ 3.8
Reconciling adjustments:
Depreciation and amortization	34.5	27.0
Amortization of operating lease right of use assets	23.9	17.4
Deferred income taxes	6.5	2.7
Share-based compensation expense	4.8	3.1
Income from SSAT	(9.2)	(4.0)
Distribution from SSAT	10.5	7.8
Other	(1.1)	(0.1)
Changes in assets and liabilities:
Accounts receivable, net	(7.7)	(12.9)
Deferred dry-docking payments	(9.5)	(2.6)
Deferred dry-docking amortization	6.6	6.1
Prepaid expenses and other assets	(4.8)	(0.2)
Accounts payable, accruals and other liabilities	5.6	38.9
Operating lease liabilities	(22.5)	(16.9)
Other long-term liabilities	(1.9)	(1.5)
Net cash provided by operating activities	122.9	68.6
Cash Flows From Investing Activities:
Capitalized vessel construction expenditures		(9.1)
Other capital expenditures	(38.5)	(26.1)
Proceeds from disposal of property and equipment	1.4	14.5
Cash deposits into Capital Construction Fund		(70.4)
Withdrawals from Capital Construction Fund		70.4
Net cash used in investing activities	(37.1)	(20.7)
Cash Flows From Financing Activities:
Repayments of debt	(14.4)	(11.4)
Proceeds from revolving credit facility	108.1	111.4
Repayments of revolving credit facility	(154.9)	(133.5)
Payment of financing costs	(3.0)	(3.1)
Dividends paid	(10.1)	(9.5)
Tax withholding related to net share settlements of restricted stock units	(14.1)	(4.5)
Net cash used in financing activities	(88.4)	(50.6)
Net Decrease in Cash, Cash Equivalents and Restricted Cash	(2.6)	(2.7)
Cash, Cash Equivalents and Restricted Cash, Beginning of the Period	19.7	28.4
Cash, Cash Equivalents and Restricted Cash, End of the Period	17.1	25.7
Reconciliation of Cash, Cash Equivalents, and Restricted Cash, at End of the Period:
Total Cash, Cash Equivalents and Restricted Cash, End of the Period	17.1	25.7
Supplemental Cash Flow Information:
Interest paid, net of capitalized interest	5.7	8.6
Income tax (refunds) and payments, net	(0.4)	(0.3)
Non-cash Information:
Capital expenditures included in accounts payable, accruals and other liabilities	$ 8.8	$ 3.5