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Income taxes - Differences between income tax expense (benefit) in Puerto Rico - subnote (Details)
$ in Millions
3 Months Ended
Mar. 31, 2024
USD ($)
Reconciliation of Statutory Federal Tax Rate [Line Items]  
Income tax credits and adjustments $ 22.9
Revision Of Prior Period Error Correction Adjustment [Member]  
Reconciliation of Statutory Federal Tax Rate [Line Items]  
Income tax credits and adjustments $ 16.5