GENERAL AND SIGNIFICANT ACCOUNTING POLICIES - INVESTMENT IN SSAT (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Investments in affiliates
Investment in SSAT	$ 81.5		$ 81.2
Financial information for equity method investment
Company Share of Net Income (Loss)	(1.8)	$ 34.0
SSAT
Financial information for equity method investment
Company Share of Net Income (Loss)	(1.8)	34.0
SSAT
Investments in affiliates
Investment in SSAT	81.5		$ 81.2
Financial information for equity method investment
Operating revenue	230.8	430.4
Operating costs and expenses	(235.9)	(306.9)
Operating Income (Loss)	(5.1)	123.5
Net Income (Loss)	$ (4.8)	$ 100.1

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

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