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Derivative instruments and hedging activities - Cash Flow Hedging on AOCI (Details) - Interest rate swaps - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Mar. 31, 2021
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Amount of Gain/(Loss) Reclassified from Accumulated OCI into Income $ 2.5 $ (6.1)  
Cash Flow Hedging | Interest expense      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Amount of Gain/(Loss) Reclassified from Accumulated OCI into Income $ 1.4   $ 1.4