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Fair value measurements and financial risk management - Risk (Details)
$ in Millions
1 Months Ended 12 Months Ended
Jan. 18, 2022
USD ($)
item
Dec. 31, 2021
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Foreign Exchange Rates | Designated as Hedging Instrument        
Notes payable        
Derivative, Notional amount   $ 0.0 $ 0.0 $ 0.0
Bloom Notes        
Notes payable        
Principal amount $ 160.0      
Term of debt 3 years      
Number of notes | item 3      
Interest expense     $ 13.7  
Bloom Notes - 2023        
Notes payable        
Principal amount $ 50.0      
Interest rate 6.00%      
Bloom Notes - 2024        
Notes payable        
Principal amount $ 50.0      
Interest rate 6.00%      
Bloom Notes - 2025        
Notes payable        
Principal amount $ 60.0      
Interest rate 4.00%      
Senior Secured Notes - 2026        
Notes payable        
Gross proceeds   $ 475.0    
Interest rate   8.00% 8.00% 8.00%
Interest expense     $ 41.7 $ 1.8