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INFORMATION BY OPERATING SEGMENT (Tables)
 9 Months Ended
Jun. 30, 2016
Segment Reporting [Abstract]  
Schedule of operating segment information
 
Gas Utility
 
Gas Marketing
 
Other
 
Eliminations
 
Consolidated
Three Months Ended June 30, 2016
 
 
 
 
 
 
 
 
 
Operating Revenues:
 
 
 
 
 
 
 
 
 
Revenues from external customers
$
253.2

 
$
(4.3
)
 
$
0.4

 
$
—

 
$
249.3

Intersegment revenues
0.1

 
6.6

 
0.5

 
(7.2
)
 
—

Total Operating Revenues
253.3

 
2.3

 
0.9

 
(7.2
)
 
249.3

Operating Expenses:
 
 
 
 
 
 
 
 
 
Gas Utility
 
 
 
 
 
 
 
 
 
Natural and propane gas
61.1

 
—

 
—

 
(7.0
)
 
54.1

Other operation and maintenance
91.9

 
—

 
—

 
(0.1
)
 
91.8

Depreciation and amortization
34.2

 
—

 
—

 
—

 
34.2

Taxes, other than income taxes
27.4

 
—

 
—

 
—

 
27.4

Total Gas Utility Operating Expenses
214.6

 
—

 
—

 
(7.1
)
 
207.5

Gas Marketing and Other
—

 
3.9

 
2.7

 
(0.1
)
 
6.5

Total Operating Expenses
214.6

 
3.9

 
2.7

 
(7.2
)
 
214.0

Operating Income (Loss)
$
38.7

 
$
(1.6
)
 
$
(1.8
)
 
$
—

 
$
35.3

Net Economic Earnings (Loss)
$
18.0

 
$
1.8

 
$
(5.2
)
 
$
—

 
$
14.6

 
 
 
 
 
 
 
 
 
 
Three Months Ended June 30, 2015
 
 
 
 
 
 
 
 
 
Operating Revenues:
 
 
 
 
 
 
 
 
 
Revenues from external customers
$
260.2

 
$
14.5

 
$
0.5

 
$
—

 
$
275.2

Intersegment revenues
1.0

 
14.4

 
0.5

 
(15.9
)
 
—

Total Operating Revenues
261.2

 
28.9

 
1.0

 
(15.9
)
 
275.2

Operating Expenses:
 
 
 
 
 
 
 
 
 
Gas Utility
 
 
 
 
 
 
 
 
 
Natural and propane gas
73.2

 
—

 
—

 
(15.5
)
 
57.7

Other operation and maintenance
90.9

 
—

 
—

 
(0.3
)
 
90.6

Depreciation and amortization
32.5

 
—

 
—

 
—

 
32.5

Taxes, other than income taxes
26.2

 
—

 
—

 
—

 
26.2

Total Gas Utility Operating Expenses
222.8

 
—

 
—

 
(15.8
)
 
207.0

Gas Marketing and Other
—

 
27.4

 
4.9

 
(0.1
)
 
32.2

Total Operating Expenses
222.8

 
27.4

 
4.9

 
(15.9
)
 
239.2

Operating Income (Loss)
$
38.4

 
$
1.5

 
$
(3.9
)
 
$
—

 
$
36.0

Net Economic Earnings (Loss)
$
16.5

 
$
0.5

 
$
(5.9
)
 
$
—

 
$
11.1



 
 
 
 
 
 
 
 
 
 
 
Gas Utility
 
Gas Marketing
 
Other
 
Eliminations
 
Consolidated
Nine Months Ended June 30, 2016
 

 
 

 
 

 
 

 
 

Operating Revenues:
 
 
 
 
 
 
 
 
 
Revenues from external customers
$
1,263.5

 
$
(6.7
)
 
$
1.2

 
$
—

 
$
1,258.0

Intersegment revenues
2.0

 
29.8

 
1.4

 
(33.2
)
 
—

Total Operating Revenues
1,265.5

 
23.1

 
2.6

 
(33.2
)
 
1,258.0

Operating Expenses:
 
 
 
 
 
 
 
 
 
Gas Utility
 
 
 
 
 
 
 
 
 
Natural and propane gas
496.0

 
—

 
—

 
(32.3
)
 
463.7

Other operation and maintenance
278.4

 
—

 
—

 
(0.7
)
 
277.7

Depreciation and amortization
101.5

 
—

 
—

 
—

 
101.5

Taxes, other than income taxes
99.5

 
—

 
—

 
—

 
99.5

Total Gas Utility Operating Expenses
975.4

 
—

 
—

 
(33.0
)
 
942.4

Gas Marketing and Other
—

 
18.4

 
7.4

 
(0.2
)
 
25.6

Total Operating Expenses
975.4

 
18.4

 
7.4

 
(33.2
)
 
968.0

Operating Income (Loss)
$
290.1

 
$
4.7

 
$
(4.8
)
 
$
—

 
$
290.0

Net Economic Earnings (Loss)
$
170.5

 
$
4.5

 
$
(11.8
)
 
$
—

 
$
163.2

 
 
 
 
 
 
 
 
 
 
Nine Months Ended June 30, 2015
 

 
 

 
 

 
 

 
 

Operating Revenues:
 
 
 
 
 
 
 
 
 
Revenues from external customers
$
1,688.6

 
$
82.3

 
$
1.3

 
$
—

 
$
1,772.2

Intersegment revenues
4.0

 
52.9

 
1.5

 
(58.4
)
 
—

Total Operating Revenues
1,692.6

 
135.2

 
2.8

 
(58.4
)
 
1,772.2

Operating Expenses:
 
 
 
 
 
 
 
 
 
Gas Utility
 
 
 
 
 
 
 
 
 
Natural and propane gas
902.1

 
—

 
—

 
(57.3
)
 
844.8

Other operation and maintenance
292.3

 
—

 
—

 
(0.8
)
 
291.5

Depreciation and amortization
96.7

 
—

 
—

 
—

 
96.7

Taxes, other than income taxes
119.9

 
—

 
—

 
—

 
119.9

Total Gas Utility Operating Expenses
1,411.0

 
—

 
—

 
(58.1
)
 
1,352.9

Gas Marketing and Other
—

 
129.5

 
9.1

 
(0.3
)
 
138.3

Total Operating Expenses
1,411.0

 
129.5

 
9.1

 
(58.4
)
 
1,491.2

Operating Income (Loss)
$
281.6

 
$
5.7

 
$
(6.3
)
 
$
—

 
$
281.0

Net Economic Earnings (Loss)
$
162.8

 
$
3.0

 
$
(11.4
)
 
$
—

 
$
154.4

The Company's total assets by segment were as follows:
 
June 30,
 
September 30,
 
June 30,
 
2016
 
2015
 
2015
Total Assets:
Gas Utility
$
4,653.7

 
$
4,686.2

 
$
4,480.1

Gas Marketing
167.8

 
160.6

 
151.2

Other
1,597.7

 
1,560.2

 
1,560.6

Eliminations
(1,108.3
)
 
(1,116.8
)
 
(1,109.0
)
Total Assets
$
5,310.9

 
$
5,290.2

 
$
5,082.9
Schedule of the reconciliation of consolidated net economic earnings to consolidated net income
The following table reconciles the Company's net economic earnings to the most comparable GAAP measure, net income.
 
Three Months Ended June 30,
 
Nine Months Ended June 30,
 
2016
 
2015
 
2016
 
2015
Net Income
$
10.7

 
$
14.1

 
$
158.4

 
$
155.6

Adjustments, pre-tax:
 
 
 
 
 
 
 
Unrealized loss (gain) on energy-related derivative contracts
4.9

 
(2.9
)
 
2.9

 
(3.5
)
Lower of cost or market inventory adjustments
(0.1
)
 
(0.4
)
 
0.6

 
—

Realized (gain) loss on economic hedges prior to sale of the physical commodity
(0.3
)
 
2.5

 
(0.9
)
 
2.6

Acquisition, divestiture and restructuring activities
1.8

 
3.5

 
5.1

 
6.5

Gain on sale of property
—

 
(7.6
)
 
—

 
(7.6
)
Income tax effect of adjustments
(2.4
)
 
1.9

 
(2.9
)
 
0.8

Net Economic Earnings
$
14.6

 
$
11.1

 
$
163.2

 
$
154.4