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Derivative and hedging activities - Effect on AOCI (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Amount of gain or (loss) recognized in OCI on Derivative $ (0.1) $ (0.3)
Amount of gain or (loss) reclassified from AOCI into income 6.5 0.2
Cash Flow Hedging    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Amount of gain or (loss) recognized in OCI on Derivative (3.5) 0.0
Amount of gain or (loss) reclassified from AOCI into income 3.1 0.0
Amount of gain or (loss) recognized in income on Derivative (amount excluded from effectiveness testing) (73.7) 0.0
Cash Flow Hedging | Interest rate swaps    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Amount of gain or (loss) recognized in OCI on Derivative (3.5) 0.0
Cash Flow Hedging | Interest rate swaps | Interest income    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Amount of gain or (loss) reclassified from AOCI into income 3.1 0.0
Net Investment Hedging    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Amount of gain or (loss) recognized in OCI on Derivative (7.2) 0.0
Amount of gain or (loss) recognized in income on Derivative (amount excluded from effectiveness testing) 3.2 0.0
Net Investment Hedging | Cross-currency swaps    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Amount of gain or (loss) recognized in OCI on Derivative (7.2) 0.0
Net Investment Hedging | Cross-currency swaps | Interest income    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Amount of gain or (loss) recognized in income on Derivative (amount excluded from effectiveness testing) $ 3.2 $ 0.0