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Financial Instruments (Carrying Amount and Cumulative Hedging Adjustment) (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Sep. 30, 2022
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Cumulative hedging adjustment, included in carrying amount $ 80.5 $ 77.1
Long-term debt    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Carrying amounts of hedged item 2,011.4 2,012.9
Cumulative hedging adjustment, included in carrying amount $ (80.5) $ (77.1)