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REPORTABLE SEGMENTS (Details) $ in Millions	3 Months Ended
	Mar. 31, 2021 USD ($) segment	Mar. 31, 2020 USD ($) segment
Segment results
Number of reportable segments | segment	2	2
Total Operating Revenue	$ 711.8	$ 513.9
Total Operating Income	120.2	13.0
Interest expense, net	(7.3)	(8.6)
Other income (expense), net	1.4	0.6
Income before Income Taxes	114.3	5.0
Income taxes	(27.1)	(1.2)
Net Income	87.2	3.8
Income from SSAT	9.2	4.0
SSAT
Segment results
Income from SSAT	9.2	4.0
Intersegment Eliminations
Segment results
Total Operating Revenue	33.7	19.4
Ocean Transportation
Segment results
Total Operating Revenue	560.5	400.9
Total Operating Income	114.1	7.9
Income from SSAT	9.2	4.0
Ocean Transportation | Intersegment Eliminations
Segment results
Total Operating Revenue	15.1	9.4
Logistics
Segment results
Total Operating Revenue	151.3	113.0
Total Operating Income	6.1	5.1
Logistics | Intersegment Eliminations
Segment results
Total Operating Revenue	$ 18.6	$ 10.0

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