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Derivative and hedging activities - Gain (Loss) on Net Investment Hedges (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Foreign currency denominated debt | Net Investment Hedging | Designated as Hedging Instrument        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Net investment hedges $ (5.0) $ 0.0 $ (25.9) $ 0.0