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Derivative instruments and hedging activities - Cash Flow Hedging on AOCI (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Cash Flow Hedging | Interest expense | Interest Rate Swaps        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax $ 2.9 $ (0.9) $ 5.3 $ (2.3)