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Lease liabilities - Contractual maturities (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Disclosure of quantitative information about right-of-use assets [line items]    
Carrying value $ 624.7 $ 552.6
Lease liabilities including liabilities for assets classified as held for sale 643.4 552.6
Total contractual cash flows 1,312.8 1,131.0
Assets and liabilities classified as held for sale    
Disclosure of quantitative information about right-of-use assets [line items]    
Total contractual cash flows $ 18.7  
Weighted average    
Disclosure of quantitative information about right-of-use assets [line items]    
Average remaining lease term 13 years  
Within one year    
Disclosure of quantitative information about right-of-use assets [line items]    
Total contractual cash flows $ 114.0 92.4
2-3 years    
Disclosure of quantitative information about right-of-use assets [line items]    
Total contractual cash flows 214.1 179.8
4-5 years    
Disclosure of quantitative information about right-of-use assets [line items]    
Total contractual cash flows 195.3 173.8
Over 5 years    
Disclosure of quantitative information about right-of-use assets [line items]    
Total contractual cash flows $ 789.4 $ 685.0