SIGNIFICANT ACCOUNTING POLICIES - RECOGNITION OF REVENUES AND EXPENSES (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Total	$ 645.2	$ 572.1	$ 1,683.2	$ 1,662.4
Ocean Transportation
Ocean Transportation services	490.8	424.1	1,284.5	1,218.6
Terminal and other related services	5.1	8.3	15.5	19.8
Fuel sales	1.3	3.3	6.0	7.9
Vessel management services and related costs	1.1	1.5	$ 4.0	$ 4.2
Percentage of ocean transportation revenues and fuel sales denominated in foreign currency			3.00%	3.00%
Total	498.3	437.2	$ 1,310.0	$ 1,250.5
Logistics
Transportation Brokerage and Freight Forwarding Services	133.0	123.5	337.0	378.5
Warehouse and distribution services	9.5	8.5	25.9	25.2
Supply chain management and other services	4.4	2.9	10.3	8.2
Total	$ 146.9	134.9	$ 373.2	$ 411.9
Percentage of transportation brokerage and freight forwarding services revenue denominated in foreign currency			3.00%	3.00%
Reclassify Transportation Brokerage and Freight Forwarding Services | Logistics
Transportation Brokerage and Freight Forwarding Services		(3.9)		$ (10.0)
Warehouse and distribution services		$ 3.9		$ 10.0