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Intangible Assets and Goodwill - Intangible Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Sep. 30, 2025
Intangible Assets [Line Items]    
Cost $ 1,556.5 $ 1,549.1
Accumulated Amortization (615.1) (588.4)
Total 1,732.0 1,724.4
Trade names    
Intangible Assets [Line Items]    
Indefinite-lived assets: 175.5 175.3
Customer relationships    
Intangible Assets [Line Items]    
Cost 1,245.7 1,239.7
Accumulated Amortization (439.3) (419.1)
Trade names    
Intangible Assets [Line Items]    
Cost 189.3 189.0
Accumulated Amortization (116.7) (113.4)
Software    
Intangible Assets [Line Items]    
Cost 67.5 66.5
Accumulated Amortization (40.9) (39.2)
Trade names    
Intangible Assets [Line Items]    
Cost 54.0 53.9
Accumulated Amortization $ (18.2) $ (16.7)