SIGNIFICANT ACCOUNTING POLICIES - INVESTMENT IN SSAT (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Investments in affiliates
Investment in Terminal Joint Venture	$ 93.1		$ 93.1		$ 58.7
Financial information for equity method investment
Company Share of Net Income	24.7	$ 12.8	58.7	$ 22.0
SSAT
Financial information for equity method investment
Company Share of Net Income	24.7	12.8	58.7	22.0
SSAT
Investments in affiliates
Investment in Terminal Joint Venture	93.1		93.1		$ 58.7
Financial information for equity method investment
Operating revenue	391.1	322.2	821.5	628.3
Operating costs and expenses	(300.5)	(284.0)	(607.4)	(557.1)
Operating Income	90.6	38.2	214.1	71.2
Net Income	$ 78.0	$ 34.3	$ 178.1	$ 63.2

The aggregate cost of goods produced and sold and services rendered during the reporting period.

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