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Commitments and contingencies - Additional information (Details)
$ in Millions
 6 Months Ended
Jun. 30, 2022
USD ($)
Mar. 06, 2022
AUD ($)
Dec. 31, 2021
USD ($)
Other Disclosures [Line Items]      
Capital commitments $ 2,905.0   $ 2,551.0
Contractual capital commitments 1,300.0   1,100.0
Contingent liabilities indemnities and other performance guarantees 275.0   441.0
Penalty for single contravention of disclosure obligations   $ 750,000  
Contractual payments 10.5    
Decarbonisation projects      
Other Disclosures [Line Items]      
Capital commitments 7,500.0    
Joint ventures      
Other Disclosures [Line Items]      
Capital commitments $ 17.0   $ 11.0