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Other Operating Income, Net (Tables)
 12 Months Ended
Sep. 30, 2018
Component of Operating Income [Abstract]  
Other Operating Income, Net
Other operating income, net, comprises the following:
 
2018
 
2017
 
2016
Finance charges
$
16.4

 
$
11.8

 
$
15.2

AFUDC associated with pipeline projects
—

 
5.5

 
3.3

Interest and interest-related income
3.2

 
1.7

 
0.2

Utility non-tariff service income
2.8

 
1.5

 
2.6

Loss on private equity partnership investment
—

 
(11.0
)
 
—

Gains (losses) on sales of fixed assets, net
5.3

 
(3.9
)
 
3.3

Other, net
3.6

 
4.9

 
(2.2
)
Total other operating income, net
$
31.3

 
$
10.5

 
$
22.4