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Long-term and Short-term Debt - Schedule of Long-term Debt (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Sep. 30, 2017
Long-term debt    
Unamortized discount and other $ (50.8) $ (52.0)
Total 1,225.2 1,493.4
Less current portion 0.0 (250.0)
Long-term debt 1,225.2 1,243.4
5.65% notes, repaid in December 2017    
Long-term debt    
Debt instruments 0.0 $ 250.0
Stated interest rate   5.65%
2.050% notes, payable in March 2020    
Long-term debt    
Debt instruments $ 294.6 $ 298.7
Stated interest rate 2.05%  
2.875% notes, payable in March 2025    
Long-term debt    
Debt instruments $ 281.4 296.7
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%  
6.25% debentures, payable in December 2037    
Long-term debt    
Debt instruments $ 250.0 250.0
Stated interest rate 6.25%  
5.20% debentures, payable in January 2098    
Long-term debt    
Debt instruments $ 200.0 $ 200.0
Stated interest rate 5.20%