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Other Operating Income, Net (Tables)
 12 Months Ended
Sep. 30, 2017
Component of Operating Income [Abstract]  
Other Operating Income, Net
Other operating income, net, comprises the following:
 
2017
 
2016
 
2015
Finance charges
$
11.8

 
$
15.2

 
$
12.7

AFUDC associated with pipeline projects
5.5

 
3.3

 
—

Interest and interest-related income
1.7

 
0.2

 
0.8

Utility non-tariff service income
1.5

 
2.6

 
4.8

Loss on private equity partnership investment
(11.0
)
 
—

 
—

(Losses) gains on sales of fixed assets, net
(3.9
)
 
3.3

 
11.1

Other, net
4.9

 
(2.2
)
 
15.0

Total other operating income, net
$
10.5

 
$
22.4

 
$
44.4