GENERAL SIGNIFICANT ACCOUNTING POLICIES - CAPITAL CONSTRUCTION FUND (Details) $ in Millions	9 Months Ended
	Sep. 30, 2023 USD ($) item	Sep. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)
Cash deposits	$ 120.8	$ 579.7
Qualifying cash withdrawal payments	49.9	14.7
Accounts receivable, net	$ 305.2		$ 268.5
Number of vessels under agreements for construction | item	3
Eligible Accounts Receivable Assigned to CCF
Capital construction fund	$ 591.6	565.0	518.2
Cash deposits	100.0	579.7
Interest earned	23.3
Qualifying cash withdrawal payments	(49.9)	(14.7)
Amount pledged to capital construction fund	200.0	$ 0.0
Accounts receivable, net	$ 213.2		$ 9.9
Weighted average life of securities held within the fund	44 days