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FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022
Fair value of financial instruments
Restricted Cash	$ 3.9		$ 3.9
Carrying value
Fair value of financial instruments
Cash and cash equivalents	156.5	$ 249.8
Restricted Cash	3.9	3.9
Capital construction fund	591.6	518.2
Fixed rate debt	450.3	517.5
Fair Value Measurement
Fair value of financial instruments
Cash and cash equivalents	156.5	249.8
Restricted Cash	3.9	3.9
Capital construction fund	591.6	518.2
Fixed rate debt	351.7	427.3
Fair Value Measurement | Quoted Prices in Active Markets (Level 1)
Fair value of financial instruments
Cash and cash equivalents	156.5	249.8
Restricted Cash	3.9	3.9
Capital construction fund	591.6	518.2
Fair Value Measurement | Significant Observable Inputs (Level 2)
Fair value of financial instruments
Fixed rate debt	$ 351.7	$ 427.3

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The balance of cash on deposit in capital construction fund.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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