SIGNIFICANT ACCOUNTING POLICIES - RECOGNITION OF REVENUES AND EXPENSES (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Total	$ 572.1	$ 589.4	$ 1,662.4	$ 1,657.9
Ocean Transportation
Ocean Transportation services	424.1	424.2	1,218.6	1,190.3
Terminal and other related services	8.3	8.0	19.8	19.2
Fuel sales	3.3	3.4	7.9	8.5
Vessel management services and related costs	1.5	1.7	$ 4.2	$ 5.2
Percentage of ocean transportation revenues and fuel sales denominated in foreign currency			3.00%	3.00%
Total	437.2	437.3	$ 1,250.5	$ 1,223.2
Logistics
Transportation Brokerage and Freight Forwarding Services	127.4	144.2	388.5	411.7
Warehouse and distribution services	4.6	4.5	15.2	13.3
Supply chain management and other services	2.9	3.4	8.2	9.7
Total	134.9	152.1	$ 411.9	$ 434.7
Percentage of transportation brokerage and freight forwarding services revenue denominated in foreign currency			3.00%	3.00%
Ocean Transportation
Total	437.2	437.3	$ 1,250.5	$ 1,223.2
Logistics
Total	$ 134.9	$ 152.1	$ 411.9	$ 434.7