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Financial Instruments and Risk Management (Narrative) (Details)
$ in Millions
3 Months Ended 6 Months Ended 9 Months Ended
Jun. 30, 2024
USD ($)
contracts
Jun. 30, 2023
Mar. 31, 2024
USD ($)
Jun. 30, 2024
USD ($)
contracts
Jun. 30, 2023
Sep. 30, 2023
USD ($)
Derivative [Line Items]            
Long-term debt $ 1,300.0     $ 1,300.0   $ 1,372.0
Fixed rate            
Derivative [Line Items]            
Long-term debt 1,250.0     1,250.0   1,250.0
Fair value of long-term debt $ 1,135.3     $ 1,135.3   $ 1,028.6
Not designated as hedge | FX contract            
Derivative [Line Items]            
Open foreign currency contracts | contracts 1     1    
Derivative, notional amount $ 9.0     $ 9.0    
Not designated as hedge | FX contract | Other expense (income), net            
Derivative [Line Items]            
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]            
Cash flow hedge | Designated as hedge | FX contract            
Derivative [Line Items]            
Open foreign currency contracts | contracts 64     64    
Derivative, notional amount $ 107.6     $ 107.6    
Gain (loss) recognized in OCI     $ 4.4 $ 4.3