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Long-term and Short-term Debt (Tables)
6 Months Ended
Mar. 31, 2019
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments Long-term debt consists of (in millions):
 
 
March 31,
2019
 
September 30, 2018
2.050% notes, payable in March 2020
 
$
297.4

 
$
294.6

2.875% notes, payable in March 2025
 
295.0

 
281.4

6.70% debentures, payable in January 2028
 
250.0

 
250.0

3.500% notes, payable in March 2029
 
425.0

 

6.25% debentures, payable in December 2037
 
250.0

 
250.0

4.200% notes, payable in March 2049
 
575.0

 

5.20% debentures, payable in January 2098
 
200.0

 
200.0

Unamortized discount and other
 
(62.6
)
 
(50.8
)
Total
 
2,229.8

 
1,225.2

Less current portion
 
(297.4
)
 

Long-term debt
 
$
1,932.4

 
$
1,225.2