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Other Operating Income, Net (Tables)
 12 Months Ended
Sep. 30, 2016
Component of Operating Income [Abstract]  
Other Operating Income, Net
Other operating income, net, comprises the following:
 
2016
 
2015
 
2014
Interest and interest-related income
$
0.2

 
$
0.8

 
$
3.6

Utility non-tariff service income
2.6

 
4.8

 
2.7

Finance charges
15.2

 
12.7

 
17.5

Gains on sales of fixed assets, net
3.3

 
11.1

 
5.4

Other, net
1.1

 
15.0

 
6.9

Total other operating income, net
$
22.4

 
$
44.4

 
$
36.1