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REPORTABLE SEGMENTS (Details) $ in Millions	3 Months Ended						6 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Jun. 30, 2021 segment	Jun. 30, 2020 segment	Sep. 30, 2021 USD ($) segment	Sep. 30, 2020 USD ($)
Segment results
Number of reportable segments | segment							2	2	2
Total Operating Revenue	$ 1,071.6			$ 645.2					$ 2,658.3	$ 1,683.2
Total Operating Income	377.9			98.4					712.0	162.6
Interest expense, net	(5.1)			(5.7)					(17.9)	(22.5)
Other income (expense), net	1.8			2.4					4.7	4.5
Income before Income Taxes	374.6			95.1					698.8	144.6
Income taxes	(91.4)			(24.2)					(165.9)	(37.1)
Net Income	283.2	$ 162.5	$ 87.2	70.9	$ 32.8	$ 3.8			532.9	107.5
Income from SSAT	13.0			7.7					35.0	15.4
SSAT
Segment results
Income from SSAT	13.0			7.7					35.0	15.4
Intersegment Eliminations
Segment results
Total Operating Revenue	57.8			40.2					140.5	83.8
Ocean Transportation
Segment results
Total Operating Revenue	863.5			498.3					2,106.9	1,310.0
Total Operating Income	361.9			86.5					677.0	136.7
Income from SSAT	13.0			7.7
Ocean Transportation | Intersegment Eliminations
Segment results
Total Operating Revenue	21.8			22.4					55.6	43.7
Logistics
Segment results
Total Operating Revenue	208.1			146.9					551.4	373.2
Total Operating Income	16.0			11.9					35.0	25.9
Logistics | Intersegment Eliminations
Segment results
Total Operating Revenue	$ 36.0			$ 17.8					$ 84.9	$ 40.1

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