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FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)
9 Months Ended
Sep. 30, 2023
FAIR VALUE OF FINANCIAL INSTRUMENTS  
Schedule of fair value measurement

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Quoted Prices in

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Significant

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Significant

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Total

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Active Markets

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Observable 

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Unobservable 

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    Carrying Value    

    

        Total         

    

(Level 1)

    

Inputs (Level 2)

    

Inputs (Level 3)

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(In millions)

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September 30, 2023

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Fair Value Measurements at September 30, 2023

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Cash and cash equivalents

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$

156.5

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$

156.5

​

$

156.5

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$

—

​

$

—

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Restricted cash

​

$

3.9

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$

3.9

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$

3.9

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$

—

​

$

—

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Capital Construction Fund

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$

591.6

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$

591.6

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$

591.6

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$

—

​

$

—

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Fixed rate debt

​

$

450.3

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$

351.7

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$

—

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$

351.7

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$

—

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(In millions)

    

December 31, 2022

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               Fair Value Measurements at December 31, 2022           

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Cash and cash equivalents

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$

249.8

​

$

249.8

  

$

249.8

​

$

—

​

$

—

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Restricted cash

​

$

3.9

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$

3.9

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$

3.9

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$

—

​

$

—

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Capital Construction Fund

​

$

518.2

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$

518.2

​

$

518.2

​

$

—

​

$

—

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Fixed rate debt

​

$

517.5

​

$

427.3

​

$

—

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$

427.3

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$

—

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