SIGNIFICANT ACCOUNTING POLICIES - RECOGNITION OF REVENUES AND EXPENSES (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Total	$ 874.9	$ 524.1	$ 1,586.7	$ 1,038.0
Ocean Transportation
Total	682.9	410.8	1,243.4	811.7
Logistics
Total	192.0	113.3	343.3	226.3
Ocean Transportation
Ocean Transportation services	674.4	402.6	1,228.6	793.7
Terminal and other related services	4.9	4.6	7.7	10.4
Fuel sales	1.8	2.1	3.2	4.7
Vessel management and related services	1.8	1.5	3.9	2.9
Total	682.9	410.8	$ 1,243.4	$ 811.7
Percentage of ocean transportation revenues and fuel sales denominated in foreign currency			3.00%	3.00%
Logistics
Transportation Brokerage and Freight Forwarding Services	174.5	101.9	$ 309.8	$ 204.0
Warehouse and distribution services	10.4	8.2	19.6	16.4
Supply chain management and other services	7.1	3.2	13.9	5.9
Total	$ 192.0	$ 113.3	$ 343.3	$ 226.3
Percentage of transportation brokerage and freight forwarding services revenue denominated in foreign currency			3.00%	3.00%