GENERAL AND SIGNIFICANT ACCOUNTING POLICIES - PREPAID EXPENSES AND OTHER ASSETS (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Prepaid Expenses and Other Assets:
Income tax receivables, net	$ 105.2	$ 170.8
Prepaid fuel	26.7	26.3
Prepaid insurance and insurance related receivables	16.9	17.4
Prepaid operating expenses	8.3	9.0
Prepaid leases	5.4	4.8
Restricted cash - vessel construction obligations	3.9	3.9
Other	7.7	9.1
Total	$ 174.1	$ 241.3