PROPERTY AND EQUIPMENT (Details) $ in Millions	Mar. 31, 2024 USD ($) item	Dec. 31, 2023 USD ($) item
Property and equipment
Property and Equipment	$ 3,535.9	$ 3,487.2
Less: Accumulated Depreciation	(1,420.2)	(1,397.3)
Property and equipment, net	$ 2,115.7	2,089.9
Number of vessels under agreements for construction | item	3
Vessels
Property and equipment
Property and Equipment	$ 2,329.3	2,323.4
Containers and equipment
Property and equipment
Property and Equipment	859.5	845.0
Terminal facilities and other property
Property and equipment
Property and Equipment	148.9	148.0
Vessel construction in progress
Property and equipment
Property and Equipment	$ 104.3	$ 103.1
Number of vessels under agreements for construction | item	3	3
Other construction in progress
Property and equipment
Property and Equipment	$ 93.9	$ 67.7