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Derivative instruments and hedging activities - Schedule of Derivative Instruments, Gain (Loss) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Interest Rate Swaps | Cash Flow Hedging | Interest expense        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Other comprehensive income (loss), cash flow hedge, gain (loss), reclassification, before tax $ 3.1 $ 0.4 $ 8.4 $ (1.9)