SIGNIFICANT ACCOUNTING POLICIES - RECOGNITION OF REVENUES AND EXPENSES (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Total	$ 711.8	$ 513.9
Ocean Transportation
Total	560.5	400.9
Logistics
Total	151.3	113.0
Ocean Transportation
Ocean Transportation services	554.2	391.1
Terminal and other related services	2.8	5.8
Fuel sales	1.4	2.6
Vessel management and related services	2.1	1.4
Total	$ 560.5	$ 400.9
Percentage of ocean transportation revenues and fuel sales denominated in foreign currency	3.00%	3.00%
Logistics
Transportation Brokerage and Freight Forwarding Services	$ 135.3	$ 102.1
Warehouse and distribution services	9.2	8.2
Supply chain management and other services	6.8	2.7
Total	$ 151.3	$ 113.0
Percentage of transportation brokerage and freight forwarding services revenue denominated in foreign currency	5.00%	3.00%