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Fair value of financial instruments - carrying value and FV (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Carrying Amount    
Fair value of financial instruments    
Long-term debt, including current portion $ 487.2 $ 560.4
Convertible debentures 90.3 88.5
Fair Value    
Fair value of financial instruments    
Long-term debt, including current portion 539.0 589.5
Convertible debentures $ 94.6 $ 93.0