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Debt (Summary of long-term debt maturities) (Details) - USD ($)
$ in Millions
6 Months Ended
Mar. 31, 2019
Sep. 30, 2018
Short-term Debt [Line Items]    
2019 $ 0.0  
2020 1,250.0  
2021 500.0  
2022 1,000.0  
2023 1,517.4  
Thereafter 4,950.0  
Total 9,217.4 $ 9,548.4
Commercial Paper [Member]    
Short-term Debt [Line Items]    
Maximum allowable amount under Commercial Paper Program $ 3,000.0  
Maximum [Member] | Commercial Paper [Member]    
Short-term Debt [Line Items]    
Maximum allowable maturity period of credit under Commercial Paper Program 397 days