v3.25.2
Short-Term and Long-Term Debt - Narrative (Details)
$ in Millions
9 Months Ended 12 Months Ended
Jun. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
May 31, 2025
USD ($)
Apr. 01, 2025
USD ($)
Dec. 31, 2022
USD ($)
Debt Instrument [Line Items]          
Short-term debt $ 846.0 $ 771.0      
Notes Payable to Banks | Senior Unsecured 364-Day Term Loan          
Debt Instrument [Line Items]          
Debt instrument, face amount     $ 500.0    
Notes Payable, Other Payables | Unsecured Revolving Credit Facility Expiring in 2027          
Debt Instrument [Line Items]          
Existing unsecured revolving credit facility     $ 1,500.0    
Existing unsecured revolving credit facility, interest rate 5.45%        
EBITDA to interest ratio, minimum     3.0    
Commercial Paper          
Debt Instrument [Line Items]          
Short-term debt $ 260.0 $ 657.0      
Debt, weighted average interest rate 4.51% 5.14%      
Debt instrument, term 11 days 24 days      
Line of Credit          
Debt Instrument [Line Items]          
Line of credit facility, maximum borrowing capacity         $ 75.0
Short-term bank loans and notes payable $ 70.0 $ 70.0      
Stated interest rate 5.32% 6.17%      
Interest Bearing Loan          
Debt Instrument [Line Items]          
Short-term debt $ 14.0 $ 42.0   $ 14.0