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Derivative instruments and hedging activities - Cash Flow Hedging on AOCI (Details) - Interest Rate Swaps - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Amount of Gain (Loss) Reclassified from Accumulated OCI into Gain (Loss) $ 5.9   $ 8.5
Cash Flow Hedging | Interest expense      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Amount of Gain (Loss) Reclassified from Accumulated OCI into Gain (Loss) $ 2.4 $ 1.4