v3.25.1
Financial Instruments and Risk Management (Schedule of Gains and Losses on Derivative Instruments) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2025
Dec. 31, 2024
Mar. 31, 2024
Mar. 31, 2025
Mar. 31, 2024
Derivative Instruments, Gain (Loss) [Line Items]          
Derivative Instrument, Gain (Loss) Reclassified from AOCI into Income, Effective Portion, Statement of Income or Comprehensive Income [Extensible Enumeration] Nonoperating Income (Expense)   Nonoperating Income (Expense) Nonoperating Income (Expense) Nonoperating Income (Expense)
FX contract | Designated as hedge | Cash flow hedge          
Derivative Instruments, Gain (Loss) [Line Items]          
Gain (loss) recognized in OCI   $ (2.4)   $ 0.7  
Unrealized Gain (Loss) on Interest Rate Cash Flow Hedges, Pretax, Accumulated Other Comprehensive Income (Loss) $ (2.8)   $ 4.8 4.9 $ 1.5
FX contract | Not designated as hedge          
Derivative Instruments, Gain (Loss) [Line Items]          
Gain (loss) recognized in income $ 0.3   $ 1.7 $ 0.6 $ 0.6