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FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables) | 6 Months Ended
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Jun. 30, 2023
FAIR VALUE OF FINANCIAL INSTRUMENTS |
Schedule of fair value measurement | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | Quoted Prices in | ​ | Significant | ​ | Significant | ​
​ | ​ | Total | ​ | ​ | ​ | Active Markets | ​ | Observable | ​ | Unobservable | ​
​ |  | Carrying Value |  | Total |  | (Level 1) |  | Inputs (Level 2) |  | Inputs (Level 3) | ​
(In millions) | ​ | June 30, 2023 | ​ | Fair Value Measurements at June 30, 2023 | ​
Cash and cash equivalents | ​ | $ | 122.0 | ​ | $ | 122.0 | ​ | $ | 122.0 | ​ | $ | — | ​ | $ | — | ​
Restricted cash | ​ | $ | 3.9 | ​ | $ | 3.9 | ​ | $ | 3.9 | ​ | $ | — | ​ | $ | — | ​
Capital Construction Fund | ​ | $ | 583.9 | ​ | $ | 583.9 | ​ | $ | 583.9 | ​ | $ | — | ​ | $ | — | ​
Fixed rate debt | ​ | $ | 462.4 | ​ | $ | 377.6 | ​ | $ | — | ​ | $ | 377.6 | ​ | $ | — | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(In millions) |  | December 31, 2022 | ​ | Fair Value Measurements at December 31, 2022 | ​
Cash and cash equivalents | ​ | $ | 249.8 | ​ | $ | 249.8 |  | $ | 249.8 | ​ | $ | — | ​ | $ | — | ​
Restricted cash | ​ | $ | 3.9 | ​ | $ | 3.9 | ​ | $ | 3.9 | ​ | $ | — | ​ | $ | — | ​
Capital Construction Fund | ​ | $ | 518.2 | ​ | $ | 518.2 | ​ | $ | 518.2 | ​ | $ | — | ​ | $ | — | ​
Fixed rate debt | ​ | $ | 517.5 | ​ | $ | 427.3 | ​ | $ | — | ​ | $ | 427.3 | ​ | $ | — | ​

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- Definition Tabular disclosure of financial instruments measured at fair value, including those classified in shareholders' equity measured on a recurring or nonrecurring basis. Disclosures include, but are not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. Nonrecurring fair value measurements are those that are required or permitted in the statement of financial position in particular circumstances. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2C -SubTopic 10 -Topic 820 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2C Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-3 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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