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Derivative and hedging activities - Narrative (Details)
€ in Millions
12 Months Ended
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2023
EUR (€)
Apr. 30, 2023
USD ($)
Apr. 11, 2023
USD ($)
Dec. 31, 2022
USD ($)
Forecast            
Derivatives, Fair Value [Line Items]            
Gain reclassified to interest expense, next 12 months $ 20,300,000          
Cross-currency swaps | Net Investment Hedging            
Derivatives, Fair Value [Line Items]            
Derivative, Notional Amount   $ 750,000,000.0        
Foreign exchange products | Designated as Hedging Instrument | 3.875% unsecured notes            
Derivatives, Fair Value [Line Items]            
Derivative liability | €     € 400.0      
Debt Instrument, Interest Rate, Effective Percentage   3.875% 3.875%      
Foreign currency denominated debt | Designated as Hedging Instrument | 3.875% unsecured notes            
Derivatives, Fair Value [Line Items]            
Accumulated loss related to the foreign currency denominated debt designated as net investment hedges   $ (28,500,000)       $ (24,300,000)
Interest rate swaps | Coversion of SOFR Floating Rate to Fixed Rate            
Derivatives, Fair Value [Line Items]            
Derivative, Notional Amount       $ 100,000,000    
Interest rate swaps | Conversion from LIBOR to SOFR Floating Rate            
Derivatives, Fair Value [Line Items]            
Derivative, Notional Amount         $ 750,000,000