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Goodwill and intangible assets - Schedule of Finite-Lived Intangible Assets (Details) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2024
Sep. 30, 2024
Finite-Lived Intangible Assets [Line Items]    
Cumulative translation adjustment $ (14.5)  
Gross Carrying Amount 784.7 $ 786.2
Trademarks and trade names - indefinite lived 639.9 641.6
Total Other intangible assets, net 1,424.6 1,427.8
Accumulated Amortization (370.6) (356.9)
Net Carrying Amount 414.1 429.3
Total Other intangible assets, net 1,054.0 1,070.9
Trademarks and trade names - indefinite lived    
Finite-Lived Intangible Assets [Line Items]    
Trademarks and trade names - indefinite lived   641.6
Trade names    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 154.5 155.0
Accumulated Amortization (39.7) (37.8)
Net Carrying Amount 114.8 117.2
Customer Relationships    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 394.4 395.0
Accumulated Amortization (173.0) (166.8)
Net Carrying Amount 221.4 228.2
Patents    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 34.1 34.5
Accumulated Amortization (21.2) (21.0)
Net Carrying Amount 12.9 13.5
Proprietary Technology    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 172.5 172.5
Accumulated Amortization (121.9) (117.5)
Net Carrying Amount 50.6 55.0
Proprietary Formula    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 29.2 29.2
Accumulated Amortization (14.8) (13.8)
Net Carrying Amount $ 14.4 $ 15.4