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Convertible debt - Narrative (Details)
$ / shares in Units, $ in Millions
2 Months Ended 12 Months Ended
May 31, 2022
USD ($)
$ / shares
Sep. 29, 2021
USD ($)
day
$ / shares
Dec. 31, 2022
USD ($)
Dec. 31, 2023
USD ($)
Oct. 31, 2022
USD ($)
Oct. 31, 2021
USD ($)
Oct. 31, 2020
USD ($)
Debt Instrument [Line Items]              
Conversion feature of convertible debt (refer to Note 17)     $ 22.5 $ 0.4 $ 43.9 $ 29.0  
Fair value gain (loss) on embedded derivatives     21.4 22.1 31.3 (1.4)  
KSP Convertible Notes              
Debt Instrument [Line Items]              
Conversion feature of convertible debt (refer to Note 17)   $ 27.7          
Debt instrument, liability component of convertible debt   72.3 85.4 99.1 83.3 71.9 $ 0.0
Transaction costs   1.6          
Fair value gain (loss) on embedded derivatives     3.1 6.0 19.9 (1.3)  
Glencore Convertible Notes              
Debt Instrument [Line Items]              
Debt instrument, face amount       225.3      
Conversion feature of convertible debt (refer to Note 17) $ 46.2            
Debt instrument, liability component of convertible debt 153.8   164.9 188.6 161.3 0.0 0.0
Transaction costs 1.3            
Fair value gain (loss) on embedded derivatives     18.3 16.1 11.4 0.0  
Convertible Debt | Initial KSP Note              
Debt Instrument [Line Items]              
Debt instrument, face amount   $ 100.0   100.0      
Convertible Debt | KSP Convertible Notes              
Debt Instrument [Line Items]              
Debt instrument, face amount     110.2 119.3 105.9 100.0 100.0
Debt instrument, interest rate, effective percentage   14.90%          
Debt instrument, convertible, conversion price (in dollars per share) | $ / shares   $ 13.43          
Debt instrument, convertible, stock price trigger (in dollars per share) | $ / shares   $ 17.46          
Debt instrument, convertible, threshold trading days | day   20          
Debt instrument, redemption price, percentage   130.00%          
Convertible Debt | KSP Convertible Notes | London Interbank Offered Rate (LIBOR) | Variable Rate Component One              
Debt Instrument [Line Items]              
Debt instrument, basis spread on variable rate   5.00%          
Convertible Debt | KSP Convertible Notes | London Interbank Offered Rate (LIBOR) | Variable Rate Component Two              
Debt Instrument [Line Items]              
Debt instrument, basis spread on variable rate   6.00%          
Convertible Debt | KSP Convertible Notes | Minimum | London Interbank Offered Rate (LIBOR) | Variable Rate Component Two              
Debt Instrument [Line Items]              
Debt instrument, basis spread on variable rate   1.00%          
Convertible Debt | KSP Convertible Notes | Maximum | London Interbank Offered Rate (LIBOR) | Variable Rate Component Two              
Debt Instrument [Line Items]              
Debt instrument, basis spread on variable rate   2.00%          
Convertible Debt | Initial Glencore Note              
Debt Instrument [Line Items]              
Debt instrument, face amount $ 200.0     200.0      
Debt instrument, interest rate, effective percentage 13.50%            
Convertible Debt | Initial Glencore Note | Secured Overnight Financing Rate (SOFR)              
Debt Instrument [Line Items]              
Debt instrument, basis spread on variable rate 0.42826%            
Convertible Debt | Initial Glencore Note | Secured Overnight Financing Rate (SOFR) | Variable Rate Component One              
Debt Instrument [Line Items]              
Debt instrument, basis spread on variable rate 5.00%            
Convertible Debt | Initial Glencore Note | Secured Overnight Financing Rate (SOFR) | Variable Rate Component Two              
Debt Instrument [Line Items]              
Debt instrument, basis spread on variable rate 6.00%            
Convertible Debt | Initial Glencore Note | Minimum | Secured Overnight Financing Rate (SOFR)              
Debt Instrument [Line Items]              
Debt instrument, basis spread on variable rate 1.00%            
Convertible Debt | Initial Glencore Note | Maximum | Secured Overnight Financing Rate (SOFR)              
Debt Instrument [Line Items]              
Debt instrument, basis spread on variable rate 2.00%            
Convertible Debt | Glencore Convertible Notes              
Debt Instrument [Line Items]              
Debt instrument, face amount     $ 208.1 $ 225.3 $ 200.0 $ 0.0 $ 0.0
Debt instrument, convertible, conversion price (in dollars per share) | $ / shares $ 9.95