SIGNIFICANT ACCOUNTING POLICIES - CASH AND ACCOUNTS RECEIVABLE (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Feb. 17, 2023
Cash and Cash Equivalents
Restricted cash	$ 3.9	$ 5.3
Allowance for doubtful accounts
Balance at Beginning of year	10.1	6.3	$ 4.3
Expense	3.2	4.2	2.9
Write-offs and Other	(0.3)	(0.4)	(0.9)
Balance at End of Year	13.0	10.1	$ 6.3
Prepaid and Other Assets:
Income tax receivables	170.8	23.1
Prepaid fuel	26.3	22.6
Prepaid insurance and insurance related receivables	17.4	10.1
Restricted cash - vessel construction obligations	3.9	5.3
Other	22.9	17.3
Total	241.3	78.4
Other Long-term Assets
Vessel and equipment spare parts	13.2	12.8
Pension plan assets	18.9	1.3
Insurance related receivables	12.1	10.4
Other	9.4	14.9
Total	53.6	$ 39.4
Capital construction fund - cash on deposit	$ 518.2			$ 100.0