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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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