SIGNIFICANT ACCOUNTING POLICIES - PREPAID EXPENSES AND OTHER ASSETS (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Prepaid Expenses and Other Assets:
Income tax receivables, net	$ 125.2	$ 170.8
Prepaid fuel	22.5	26.3
Prepaid insurance and insurance related receivables	19.3	17.4
Restricted cash - vessel construction obligations	2.3	3.9
Other	19.6	22.9
Total	188.9	241.3
Other Long-term Assets
Vessel and equipment spare parts	14.2	13.2
Pension plan assets	34.8	18.9
Insurance related receivables	10.2	12.1
Other	7.2	9.4
Total	66.4	$ 53.6
Income taxes receivable	$ 118.6