GENERAL AND SIGNIFICANT ACCOUNTING POLICIES - RECOGNITION OF REVENUES AND EXPENSES (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Total	$ 773.4	$ 1,261.1	$ 1,478.2	$ 2,426.6
Ocean. Transportation.
Ocean Transportation services	605.8	1,040.2	1,145.3	1,976.9
Terminal and other related services	6.6	4.7	13.5	8.4
Fuel sales	2.8	2.8	5.7	4.7
Vessel management and related services	1.7	1.5	3.4	3.1
Total	616.9	1,049.2	$ 1,167.9	$ 1,993.1
Percentage of ocean transportation revenues and fuel sales denominated in foreign currency			3.00%	3.00%
Logistics.
Transportation Brokerage and Freight Forwarding services	139.5	184.4	$ 277.2	$ 379.3
Warehousing and distribution services	10.0	13.8	19.6	25.9
Supply chain management and other services	7.0	13.7	13.5	28.3
Total	$ 156.5	$ 211.9	$ 310.3	$ 433.5
Percentage of transportation brokerage and freight forwarding services revenue denominated in foreign currency			3.00%	3.00%