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Derivative instruments and hedging activities - Narrative (Details) - Interest Rate Swaps - Designated as Hedging Instrument - USD ($)
Sep. 30, 2023
Jun. 30, 2023
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Derivative, notional amount   $ 350,000,000
AOCI before tax, attributable to parent $ 500,000