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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

December 31, 2022

    

December 31, 2023

Carrying

Fair

Carrying

Fair

amount

value

amount

value

(In millions)

Cash, cash equivalents and restricted cash

$

334.6

$

334.6

$

202.1

$

202.1

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

 

424.1

 

374.2

 

440.9

 

424.5