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Long-term and Short-term Debt - Schedule of Long-term Debt (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Sep. 30, 2018
Long-term debt    
Unamortized discount, capitalized lease obligations and other $ (50.1) $ (50.8)
Total 2,256.9 1,225.2
Less current portion (300.5) 0.0
Long-term debt 1,956.4 1,225.2
2.050% notes, payable in March 2020    
Long-term debt    
Debt instruments $ 299.4 294.6
Stated interest rate 2.05%  
2.875% notes, payable in March 2025    
Long-term debt    
Debt instruments $ 307.6 281.4
Stated interest rate 2.875%  
6.70% debentures, payable in January 2028    
Long-term debt    
Debt instruments $ 250.0 250.0
Stated interest rate 6.70%  
3.500% notes, payable in March 2029    
Long-term debt    
Debt instruments $ 425.0 0.0
Stated interest rate 3.50%  
6.25% debentures, payable in December 2037    
Long-term debt    
Debt instruments $ 250.0 250.0
Stated interest rate 6.25%  
4.200% notes, payable in March 2049    
Long-term debt    
Debt instruments $ 575.0 0.0
Stated interest rate 4.20%  
5.20% debentures, payable in January 2098    
Long-term debt    
Debt instruments $ 200.0 $ 200.0
Stated interest rate 5.20%