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Financial Instruments Financial Instruments (Effects of Derivatives Not Designated as a Hedging Instrument) (Details) - Not Designated as Hedging Instrument - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Other Income (Expense), Net    
Derivative Instruments, Gain (Loss) [Line Items]    
Total (Gain) Loss Recognized in Income $ (1.0) $ (3.7)
Other Income (Expense), Net | Forward Exchange Contracts    
Derivative Instruments, Gain (Loss) [Line Items]    
Total (Gain) Loss Recognized in Income (1.0) (3.7)
Other Income (Expense), Net | Other    
Derivative Instruments, Gain (Loss) [Line Items]    
Total (Gain) Loss Recognized in Income 0.0 0.0
Other Non-Operating Income (Expense), Net    
Derivative Instruments, Gain (Loss) [Line Items]    
Total (Gain) Loss Recognized in Income (2.1) (5.2)
Other Non-Operating Income (Expense), Net | Forward Exchange Contracts    
Derivative Instruments, Gain (Loss) [Line Items]    
Total (Gain) Loss Recognized in Income (2.4) (2.9)
Other Non-Operating Income (Expense), Net | Other    
Derivative Instruments, Gain (Loss) [Line Items]    
Total (Gain) Loss Recognized in Income $ 0.3 $ (2.3)