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Commitments and contingencies (Details) - Other Commercial Commitments - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Other Commitments [Line Items]    
Total $ 20.8 $ 49.2
Surety bonds, bank guarantees and performance bonds    
Other Commitments [Line Items]    
Total 20.8 43.3
Performance guarantee to Opex    
Other Commitments [Line Items]    
Total $ 0.0 $ 5.9