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Debt Debt (Summary of long-term debt maturities) (Details) - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2017
Oct. 01, 2017
Short-term Debt [Line Items]    
Maximum allowable amount under Commercial Paper Program $ 3,000.0  
2019 350.0  
2020 0.0  
2021 1,250.0  
2022 500.0  
2023 0.0  
Thereafter 2,855.3  
Total 4,955.3 $ 3,955.3
Commercial Paper [Member]    
Short-term Debt [Line Items]    
Outstanding commercial paper $ 0.0  
Maximum [Member] | Commercial Paper [Member]    
Short-term Debt [Line Items]    
Maximum allowable maturity period of credit under Commercial Paper Program 397 days