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Derivative and hedging activities - Gain (Loss) on Net Investment Hedges (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
3.875% unsecured notes | Foreign currency denominated debt | Net Investment Hedging | Designated as Hedging Instrument    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Net investment hedges $ 7.5 $ (11.0)