GENERAL AND SIGNIFICANT ACCOUNTING POLICIES - PREPAID EXPENSES AND OTHER ASSETS (Details) - USD ($) $ in Millions	Apr. 19, 2024	Sep. 30, 2024	Dec. 31, 2023
Prepaid Expenses and Other Assets:
Prepaid fuel		$ 28.5	$ 22.5
Prepaid insurance and insurance related receivables		14.8	19.3
Prepaid operating expenses		8.6	8.2
Prepaid leases		3.4	4.1
Income tax receivables, net		1.8	125.2
Restricted cash - vessel construction obligations		2.4	2.3
Other		10.9	7.3
Total		$ 70.4	188.9
Other Long-term Assets
Income taxes receivable			$ 118.6
Income tax refund	$ 118.6
Interest on income tax refund	$ 10.2