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Convertible debt - Narrative (Details)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Mar. 25, 2024
USD ($)
tranche
$ / shares
May 31, 2022
USD ($)
$ / shares
Sep. 29, 2021
USD ($)
day
$ / shares
Mar. 31, 2024
USD ($)
Jun. 30, 2023
Mar. 31, 2023
USD ($)
Dec. 31, 2023
USD ($)
Mar. 11, 2024
USD ($)
Dec. 31, 2022
USD ($)
Debt Instrument [Line Items]                  
Conversion feature of convertible debt (refer to Note 14)       $ 180.2     $ 0.4    
Debt extinguishment loss (Note 14)       58.9   $ 0.0      
Initial KSP Note | Convertible Debt                  
Debt Instrument [Line Items]                  
Amount Issued     $ 100.0 100.0          
KSP Convertible Notes                  
Debt Instrument [Line Items]                  
Conversion feature of convertible debt (refer to Note 14)     27.7            
Debt instrument, liability component of convertible debt     72.3 102.9     99.1   $ 85.4
Debt issuance costs, net     $ (1.6)            
Fair value gain (loss) on embedded derivatives       0.1   0.2 (6.0)    
KSP Convertible Notes | Convertible Debt                  
Debt Instrument [Line Items]                  
Amount Issued       119.3     119.3   110.2
Debt instrument, interest rate, effective percentage     18.70%            
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%            
KSP Convertible Notes | Convertible Debt | London Interbank Offered Rate (LIBOR) | Minimum                  
Debt Instrument [Line Items]                  
Debt instrument, basis spread on variable rate 1.00%                
KSP Convertible Notes | Convertible Debt | London Interbank Offered Rate (LIBOR) | Maximum                  
Debt Instrument [Line Items]                  
Debt instrument, basis spread on variable rate 2.00%                
KSP Convertible Notes | Convertible Debt | London Interbank Offered Rate and Secured Overnight Financing Rate | Minimum                  
Debt Instrument [Line Items]                  
Debt instrument, basis spread on variable rate         1.00%        
KSP Convertible Notes | Convertible Debt | London Interbank Offered Rate and Secured Overnight Financing Rate | Maximum                  
Debt Instrument [Line Items]                  
Debt instrument, basis spread on variable rate         2.00%        
KSP Convertible Notes | Convertible Debt | Variable Rate Component One | London Interbank Offered Rate (LIBOR)                  
Debt Instrument [Line Items]                  
Debt instrument, basis spread on variable rate     5.00%            
KSP Convertible Notes | Convertible Debt | Variable Rate Component Two | London Interbank Offered Rate (LIBOR)                  
Debt Instrument [Line Items]                  
Debt instrument, basis spread on variable rate     6.00%            
KSP Convertible Notes | Convertible Debt | Variable Rate Component Two | London Interbank Offered Rate (LIBOR) | Minimum                  
Debt Instrument [Line Items]                  
Debt instrument, basis spread on variable rate     1.00%            
KSP Convertible Notes | Convertible Debt | Variable Rate Component Two | London Interbank Offered Rate (LIBOR) | Maximum                  
Debt Instrument [Line Items]                  
Debt instrument, basis spread on variable rate     2.00%            
First A&R Glencore Note | Convertible Debt                  
Debt Instrument [Line Items]                  
Amount Issued       116.6          
Debt instrument, modification date, term after initial funding 1 month                
Debt instrument, maturity, additional term 5 years                
A&R Convertible Notes | Convertible Debt                  
Debt Instrument [Line Items]                  
Debt instrument, convertible, conversion price (in dollars per share) | $ / shares $ 9.95                
Debt instrument, convertible, conversion price adjustment, premium, percentage 25.00%                
Debt instrument, convertible, conversion price adjustment, volume weighted average trading price, duration from modification date 30 days                
Debt extinguishment loss (Note 14)       58.9          
A&R Convertible Notes And Senior Secured Convertible Glencore Notes | Convertible Debt                  
Debt Instrument [Line Items]                  
Debt instrument, convertible, conversion price (in dollars per share) | $ / shares   $ 0.206              
Senior Secured Convertible Glencore Note | Convertible Debt                  
Debt Instrument [Line Items]                  
Amount Issued $ 75.0     75.0          
Debt instrument, convertible, conversion price (in dollars per share) | $ / shares $ 0.53                
Senior Secured Convertible Glencore Note | Convertible Debt | Secured Overnight Financing Rate (SOFR)                  
Debt Instrument [Line Items]                  
Debt instrument, basis spread on variable rate 1.00%                
Senior Secured Convertible Glencore Note | Convertible Debt | Variable Rate Component One | Secured Overnight Financing Rate (SOFR)                  
Debt Instrument [Line Items]                  
Debt instrument, basis spread on variable rate 5.00%                
Senior Secured Convertible Glencore Note | Convertible Debt | Variable Rate Component Two | Secured Overnight Financing Rate (SOFR)                  
Debt Instrument [Line Items]                  
Debt instrument, basis spread on variable rate 6.00%                
Senior Secured Convertible Glencore Note | Convertible Debt | Variable Rate Component Three | Secured Overnight Financing Rate (SOFR)                  
Debt Instrument [Line Items]                  
Debt instrument, basis spread on variable rate 1.00%                
Glencore Convertible Notes                  
Debt Instrument [Line Items]                  
Amount Issued       306.2          
Conversion feature of convertible debt (refer to Note 14)   $ 46.2              
Debt instrument, liability component of convertible debt   153.8   164.6     188.6   164.9
Debt issuance costs, net   (1.3)              
Fair value gain (loss) on embedded derivatives       21.9   $ 0.5 (16.1)    
Glencore Convertible Notes | Convertible Debt                  
Debt Instrument [Line Items]                  
Amount Issued       $ 300.3     $ 225.3 $ 75.0 $ 208.1
Glencore Unsecured Convertible Notes | Convertible Debt                  
Debt Instrument [Line Items]                  
Amount Issued   $ 200.0              
Debt instrument, interest rate, effective percentage   13.50%              
Debt instrument, number of tranches | tranche 2                
Glencore Unsecured Convertible Notes | Convertible Debt | Secured Overnight Financing Rate (SOFR)                  
Debt Instrument [Line Items]                  
Debt instrument, basis spread on variable rate   0.42826%              
Glencore Unsecured Convertible Notes | Convertible Debt | Secured Overnight Financing Rate (SOFR) | Minimum                  
Debt Instrument [Line Items]                  
Debt instrument, basis spread on variable rate   1.00%              
Glencore Unsecured Convertible Notes | Convertible Debt | Secured Overnight Financing Rate (SOFR) | Maximum                  
Debt Instrument [Line Items]                  
Debt instrument, basis spread on variable rate   2.00%              
Glencore Unsecured Convertible Notes | Convertible Debt | Variable Rate Component One | Secured Overnight Financing Rate (SOFR)                  
Debt Instrument [Line Items]                  
Debt instrument, basis spread on variable rate   5.00%              
Glencore Unsecured Convertible Notes | Convertible Debt | Variable Rate Component Two | Secured Overnight Financing Rate (SOFR)                  
Debt Instrument [Line Items]                  
Debt instrument, basis spread on variable rate   6.00%