SIGNIFICANT ACCOUNTING POLICIES - RECOGNITION OF REVENUES AND EXPENSES (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Total	$ 1,071.6	$ 645.2	$ 2,658.3	$ 1,683.2
Ocean Transportation
Total	863.5	498.3	2,106.9	1,310.0
Logistics
Total	208.1	146.9	551.4	373.2
Ocean Transportation Services
Ocean Transportation services	855.2	490.8	2,083.8	1,284.5
Terminal and other related services	4.8	5.1	12.5	15.5
Fuel sales	1.9	1.3	5.1	6.0
Vessel management and related services	1.6	1.1	5.5	4.0
Total	863.5	498.3	$ 2,106.9	$ 1,310.0
Percentage of ocean transportation revenues and fuel sales denominated in foreign currency			3.00%	3.00%
Logistics Services
Transportation Brokerage and Freight Forwarding Services	186.1	133.0	$ 495.9	$ 337.0
Warehouse and distribution services	12.2	9.5	31.8	25.9
Supply chain management and other services	9.8	4.4	23.7	10.3
Total	$ 208.1	$ 146.9	$ 551.4	$ 373.2
Percentage of transportation brokerage and freight forwarding services revenue denominated in foreign currency			5.00%	5.00%