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Supplemental Information - Debt Reclassification (Details) - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2023
Sep. 30, 2023
Nonrelated Party    
Debt Instrument [Line Items]    
Long-term debt $ 11,715.4 $ 9,280.6
Note 3.35% due 2024 | Senior Notes    
Debt Instrument [Line Items]    
Interest rate, fixed percentage 3.35%  
Long-term debt, Principal Amount $ 400.0  
Credit Agreement 2021 | Revolving credit agreement    
Debt Instrument [Line Items]    
Maximum borrowing capacity 2,750.0  
Commercial Paper    
Debt Instrument [Line Items]    
Short-Term Debt, Refinanced, Amount $ 1,300.0