PROPERTY AND EQUIPMENT (Details) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($) item	Dec. 31, 2022 USD ($) item	Dec. 31, 2021 USD ($)
Property and equipment
Property and Equipment	$ 3,487.2	$ 3,288.7
Less: Accumulated Depreciation	(1,397.3)	(1,326.2)
Property and equipment, net	$ 2,089.9	1,962.5
Number of vessels under agreements for construction | item	3
Depreciation Expense	$ 124.4	123.5	$ 117.1
Vessels
Property and equipment
Property and Equipment	2,323.4	2,278.6
Less: Accumulated Depreciation	(886.8)	(838.8)
Property and equipment, net	1,436.6	1,439.8
Containers and equipment
Property and equipment
Property and Equipment	845.0	762.7
Less: Accumulated Depreciation	(451.9)	(433.8)
Property and equipment, net	393.1	328.9
Terminal facilities and other property
Property and equipment
Property and Equipment	148.0	131.5
Less: Accumulated Depreciation	(58.6)	(53.6)
Property and equipment, net	89.4	77.9
Vessel construction in progress
Property and equipment
Property and Equipment	103.1	50.2
Property and equipment, net	$ 103.1	$ 50.2
Number of vessels under agreements for construction | item	3	3
Other construction in progress
Property and equipment
Property and Equipment	$ 67.7	$ 65.7
Property and equipment, net	$ 67.7	$ 65.7