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Income tax - Reconciliation of effective tax rate (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Income tax      
Profit for the year $ 4,629.0 $ 4,649.1 $ 524.2
Income taxes 1,398.3 1,010.4 16.6
Profit excluding income taxes 6,027.3 5,659.5 540.8
Income tax using the domestic corporation tax rate 1,386.3 1,301.7 124.4
Current year losses for which no deferred tax asset was recognized 2.3    
Utilization of carried forward tax losses for which no deferred tax assets were recognized   (287.5) (115.9)
Effect of tax rates in foreign jurisdictions 0.4 1.2 3.9
Non-deductible expenses 7.3 5.9 0.2
Effect of different tax rates on specific gains 3.8 (7.6) 4.1
Effect of share of profits of associates 0.2 (0.9) (0.8)
Other (2.0) (2.4) 0.7
Total income taxes in income statements $ 1,398.3 $ 1,010.4 $ 16.6