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Derivative financial instruments - Narrative (Details)
$ in Millions
Dec. 31, 2022
USD ($)
derivativeContract
Medium-term Notes  
Derivative [Line Items]  
Notional amount $ 800.0
Interest rate swaps  
Derivative [Line Items]  
Number of interest rate swap contracts | derivativeContract 2
Fixed rate (in percent) 2.85%
Interest Rate Swap One  
Derivative [Line Items]  
Notional amount $ 200.0
Interest Rate Swap Two  
Derivative [Line Items]  
Notional amount $ 600.0