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Long-term and Short-term Debt (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Long-term debt    
Unamortized discount and other $ (54.5) $ (49.6)
Long-term debt 1,500.9 900.4
5.65% notes, payable in December 2017    
Long-term debt    
Debt instruments $ 250.0 250.0
Stated interest rate 5.65%  
Maturity date Dec. 01, 2017  
2.050% notes, payable in March 2020    
Long-term debt    
Debt instruments $ 304.2 0.0
Stated interest rate 2.05%  
Maturity date Mar. 01, 2020  
2.875% notes, payable in March 2025    
Long-term debt    
Debt instruments $ 301.2 0.0
Stated interest rate 2.875%  
Maturity date Mar. 01, 2025  
6.70% debentures, payable in January 2028    
Long-term debt    
Debt instruments $ 250.0 250.0
Stated interest rate 6.70%  
Maturity date Jan. 15, 2028  
6.25% debentures, payable in December 2037    
Long-term debt    
Debt instruments $ 250.0 250.0
Stated interest rate 6.25%  
Maturity date Dec. 01, 2037  
5.20% debentures, payable in January 2098    
Long-term debt    
Debt instruments $ 200.0 $ 200.0
Stated interest rate 5.20%  
Maturity date Jan. 15, 2098