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FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Fair value of financial instruments |  |  |
Restricted Cash | $ 2.3 | $ 3.9 | $ 5.3
Carrying value |  |  |
Fair value of financial instruments |  |  |
Cash and cash equivalents | 134.0 | 249.8 |
Restricted Cash | 2.3 | 3.9 |
Capital construction fund | 599.4 | 518.2 |
Fixed rate debt | 440.6 | 517.5 |
Fair Value Measurement |  |  |
Fair value of financial instruments |  |  |
Cash and cash equivalents | 134.0 | 249.8 |
Restricted Cash | 2.3 | 3.9 |
Capital construction fund | 599.4 | 518.2 |
Fixed rate debt | 359.9 | 427.3 |
Fair Value Measurement | Quoted Prices in Active Markets (Level 1) |  |  |
Fair value of financial instruments |  |  |
Cash and cash equivalents | 134.0 | 249.8 |
Restricted Cash | 2.3 | 3.9 |
Capital construction fund | 599.4 | 518.2 |
Fair Value Measurement | Significant Observable Inputs (Level 2) |  |  |
Fair value of financial instruments |  |  |
Fixed rate debt | $ 359.9 | $ 427.3 |

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