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INFORMATION BY OPERATING SEGMENT (Tables)
 9 Months Ended
Jun. 30, 2017
Segment Reporting [Abstract]  
Schedule of operating segment information
 
Gas Utility
 
Gas Marketing
 
Other
 
Eliminations
 
Consolidated
Three Months Ended June 30, 2017
 
 
 
 
 
 
 
 
 
Operating Revenues:
 
 
 
 
 
 
 
 
 
Revenues from external customers
$
305.1

 
$
17.9

 
$
0.5

 
$
—

 
$
323.5

Intersegment revenues
1.5

 
—

 
1.6

 
(3.1
)
 
—

Total Operating Revenues
306.6

 
17.9

 
2.1

 
(3.1
)
 
323.5

Operating Expenses:
 
 
 
 
 
 
 
 
 
Gas Utility
 
 
 
 
 
 
 
 
 
Natural and propane gas
88.7

 
—

 
—

 
(12.0
)
 
76.7

Operation and maintenance
101.9

 
—

 
—

 
(1.1
)
 
100.8

Depreciation and amortization
38.4

 
—

 
—

 
—

 
38.4

Taxes, other than income taxes
30.5

 
—

 
—

 
—

 
30.5

Total Gas Utility Operating Expenses
259.5

 
—

 
—

 
(13.1
)
 
246.4

Gas Marketing and Other
—

 
12.0

 
4.8

 
10.0

 
26.8

Total Operating Expenses
259.5

 
12.0

 
4.8

 
(3.1
)
 
273.2

Operating Income (Loss)
$
47.1

 
$
5.9

 
$
(2.7
)
 
$
—

 
$
50.3

Net Economic Earnings (Loss)
$
23.3

 
$
2.3

 
$
(4.0
)
 
$
—

 
$
21.6

 
 
 
 
 
 
 
 
 
 
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

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



 
 
 
 
 
 
 
 
 
 
 
Gas Utility
 
Gas Marketing
 
Other
 
Eliminations
 
Consolidated
Nine Months Ended June 30, 2017
 

 
 

 
 

 
 

 
 

Operating Revenues:
 
 
 
 
 
 
 
 
 
Revenues from external customers
$
1,419.1

 
$
61.8

 
$
1.1

 
$
—

 
$
1,482.0

Intersegment revenues
7.9

 
—

 
4.6

 
(12.5
)
 
—

Total Operating Revenues
1,427.0

 
61.8

 
5.7

 
(12.5
)
 
1,482.0

Operating Expenses:
 
 
 
 
 
 
 
 
 
Gas Utility
 
 
 
 
 
 
 
 
 
Natural and propane gas
578.8

 
—

 
—

 
(54.0
)
 
524.8

Operation and maintenance
301.7

 
—

 
—

 
(3.1
)
 
298.6

Depreciation and amortization
114.0

 
—

 
—

 
—

 
114.0

Taxes, other than income taxes
112.2

 
—

 
—

 
—

 
112.2

Total Gas Utility Operating Expenses
1,106.7

 
—

 
—

 
(57.1
)
 
1,049.6

Gas Marketing and Other
—

 
58.9

 
9.1

 
44.6

 
112.6

Total Operating Expenses
1,106.7

 
58.9

 
9.1

 
(12.5
)
 
1,162.2

Operating Income (Loss)
$
320.3

 
$
2.9

 
$
(3.4
)
 
$
—

 
$
319.8

Net Economic Earnings (Loss)
$
187.3

 
$
3.7

 
$
(12.9
)
 
$
—

 
$
178.1

 
 
 
 
 
 
 
 
 
 
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

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

The Company’s total assets by segment were as follows:
 
June 30,
 
September 30,
 
June 30,
 
2017
 
2016
 
2016
Total Assets:
Gas Utility
$
5,323.1

 
$
5,184.7

 
$
4,646.9

Gas Marketing
223.6

 
205.0

 
167.8

Other
2,171.8

 
1,836.6

 
1,592.6

Eliminations
(1,420.3
)
 
(1,161.9
)
 
(1,108.3
)
Total Assets
$
6,298.2

 
$
6,064.4

 
$
5,299.0
Schedule of the reconciliation of consolidated net economic earnings to consolidated net income
The following table reconciles the Company’s net economic earnings to net income.
 
Three Months Ended June 30,
 
Nine Months Ended June 30,
 
2017
 
2016
 
2017
 
2016
Net Income
$
21.7

 
$
10.7

 
$
174.9

 
$
158.4

Adjustments, pre-tax:
 
 
 
 
 
 
 
Unrealized (gain) loss on energy-related derivative contracts
(2.2
)
 
4.9

 
3.2

 
2.9

Lower of cost or market inventory adjustments
—

 
(0.1
)
 
—

 
0.6

Realized gain on economic hedges prior to sale of the physical commodity
—

 
(0.3
)
 
(0.2
)
 
(0.9
)
Acquisition, divestiture and restructuring activities
1.9

 
1.8

 
2.1

 
5.1

Income tax effect of adjustments
0.2

 
(2.4
)
 
(1.9
)
 
(2.9
)
Net Economic Earnings
$
21.6

 
$
14.6

 
$
178.1

 
$
163.2