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WBX East Africa and Alpen (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Schedule of Equity Method Investments [Line Items]      
Other current liabilities $ 459.9 $ 435.4  
Equity method (loss) earnings, net of tax (0.1) (0.3) $ (67.1)
Other $ 60.8 44.2  
Alpen Food Company South Africa (Proprietary) Limited      
Schedule of Equity Method Investments [Line Items]      
Equity Method Investment, Ownership Percentage 50.00%    
Equity method (loss) earnings, net of tax $ (0.1) (0.3) $ (0.5)
Alpen Food Company South Africa (Proprietary) Limited | Other Assets      
Schedule of Equity Method Investments [Line Items]      
Equity method investments $ 4.0 $ 3.6  
Weetabix East Africa Limited | Post      
Schedule of Equity Method Investments [Line Items]      
Noncontrolling Interest, Ownership Percentage by Parent 50.20%