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REPORTABLE SEGMENTS (Details) $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2023 USD ($)	Jun. 30, 2023 USD ($)	Mar. 31, 2023 USD ($)	Sep. 30, 2022 USD ($)	Jun. 30, 2022 USD ($)	Mar. 31, 2022 USD ($)	Sep. 30, 2023 USD ($) segment	Sep. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)
Segment results
Number of segments | segment							2
Total Operating Revenue	$ 827.5			$ 1,114.8			$ 2,305.7	$ 3,541.4
Total Operating Income	132.1			335.3			267.5	1,261.0
Interest income	9.3			1.3			26.2	1.3
Interest expense	(2.4)			(5.0)			(9.8)	(14.3)
Other income (expense), net	1.2			2.5			4.8	6.3
Income before Taxes	140.2			334.1			288.7	1,254.3
Income taxes	(20.3)			(68.1)			(54.0)	(268.4)
Net Income	119.9	$ 80.8	$ 34.0	266.0	$ 380.7	$ 339.2	234.7	985.9
Deferred dry-docking amortization							18.6	18.6
Total Assets	4,292.8						4,292.8		$ 4,330.0
Income (Loss) from SSAT	1.3			23.4			(1.9)	82.1
SSAT
Segment results
Income (Loss) from SSAT	1.3			23.4
Intersegment Eliminations
Segment results
Total Operating Revenue	61.1			78.2			155.6	220.6
Ocean Transportation
Segment results
Income (Loss) from SSAT	1.3			23.4			(1.9)	82.1
Ocean Transportation | Operating segments
Segment results
Total Operating Revenue	669.4			918.5			1,837.3	2,911.6
Total Operating Income	118.2			315.2			228.4	1,201.4
Ocean Transportation | Intersegment Eliminations
Segment results
Total Operating Revenue	22.5			28.0			57.6	73.8
Logistics | Operating segments
Segment results
Total Operating Revenue	158.1			196.3			468.4	629.8
Total Operating Income	13.9			20.1			39.1	59.6
Logistics | Intersegment Eliminations
Segment results
Total Operating Revenue	$ 38.6			$ 50.2			$ 98.0	$ 146.8

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Represents the increase (decrease) during the reporting period in the value of dry-docking amortization during the current reporting period for benefits that will be received over a period of years.

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