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FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)
9 Months Ended
Sep. 30, 2022
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, 2022

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Fair Value Measurements at September 30, 2022

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Cash and cash equivalents

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$

242.8

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$

242.8

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$

242.8

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$

—

​

$

—

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Restricted cash

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$

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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$

565.0

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$

565.0

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$

565.0

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$

—

​

$

—

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Fixed rate debt

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$

531.8

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$

438.4

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$

—

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$

438.4

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$

—

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(In millions)

    

December 31, 2021

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               Fair Value Measurements at December 31, 2021           

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Cash and cash equivalents

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$

282.4

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$

282.4

  

$

282.4

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$

—

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$

—

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Restricted cash

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$

5.3

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$

5.3

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$

5.3

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$

—

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$

—

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Fixed rate debt

​

$

629.0

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$

615.1

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$

—

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$

615.1

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$

—

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