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Derivative instruments and hedging activities - Cash Flow Hedging on AOCI (Details) - Interest rate swaps - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Amount of Gain/(Loss) Reclassified from Accumulated OCI into Income $ (11.4)   $ (15.0)
Cash Flow Hedging | Interest expense      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Amount of Gain/(Loss) Reclassified from Accumulated OCI into Income $ (3.0) $ (1.1)