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Financial instruments (Tables)
12 Months Ended
Dec. 31, 2023
Financial instruments  
Financial Instruments not Carried at Fair Value but which Require Fair Value Disclosure

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December 31, 2022

    

December 31, 2023

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Carrying

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Fair

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Carrying

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Fair

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amount

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value

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amount

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value

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(In millions)

Cash, cash equivalents and restricted cash

$

334.6

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$

334.6

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$

202.1

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$

202.1

Long-term debt - Fixed rate 3.75% Senior Secured Notes due 2025

 

424.1

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374.2

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440.9

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424.5