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INFORMATION BY OPERATING SEGMENT (Tables)
 9 Months Ended
Jun. 30, 2018
Segment Reporting [Abstract]  
Schedule of operating segment information
 
Gas Utility
 
Gas Marketing
 
Other
 
Eliminations
 
Consolidated
Three Months Ended June 30, 2018
 
 
 
 
 
 
 
 
 
Operating Revenues:
 
 
 
 
 
 
 
 
 
Revenues from external customers
$
334.8

 
$
14.4

 
$
1.4

 
$
—

 
$
350.6

Intersegment revenues
—

 
—

 
2.9

 
(2.9
)
 
—

Total Operating Revenues
334.8

 
14.4

 
4.3

 
(2.9
)
 
350.6

Operating Expenses:
 
 
 
 
 
 
 
 
 
Gas Utility
 
 
 
 
 
 
 
 
 
Natural and propane gas
117.9

 
—

 
—

 
(10.7
)
 
107.2

Operation and maintenance
107.9

 
—

 
—

 
(2.3
)
 
105.6

Depreciation and amortization
40.5

 
—

 
—

 
—

 
40.5

Taxes, other than income taxes
33.5

 
—

 
—

 
—

 
33.5

Total Gas Utility Operating Expenses
299.8

 
—

 
—

 
(13.0
)
 
286.8

Gas Marketing and Other
—

 
(7.2
)
 
8.5

 
10.1

 
11.4

Total Operating Expenses
299.8

 
(7.2
)
 
8.5

 
(2.9
)
 
298.2

Operating Income (Loss)
$
35.0

 
$
21.6

 
$
(4.2
)
 
$
—

 
$
52.4

Net Economic Earnings (Loss)
$
16.9

 
$
4.4

 
$
(6.1
)
 
$
—

 
$
15.2

 
 
 
 
 
 
 
 
 
 

 
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

 
 
 
 
 
 
 
 
 
 
 
Gas Utility
 
Gas Marketing
 
Other
 
Eliminations
 
Consolidated
Nine Months Ended June 30, 2018
 

 
 

 
 

 
 

 
 

Operating Revenues:
 
 
 
 
 
 
 
 
 
Revenues from external customers
$
1,667.3

 
$
55.3

 
$
3.2

 
$
—

 
$
1,725.8

Intersegment revenues
0.3

 
—

 
8.3

 
(8.6
)
 
—

Total Operating Revenues
1,667.6

 
55.3

 
11.5

 
(8.6
)
 
1,725.8

Operating Expenses:
 
 
 
 
 
 
 
 
 
Gas Utility
 
 
 
 
 
 
 
 
 
Natural and propane gas
784.5

 
—

 
—

 
(52.8
)
 
731.7

Operation and maintenance
353.5

 
—

 
—

 
(6.4
)
 
347.1

Depreciation and amortization
121.9

 
—

 
—

 
—

 
121.9

Taxes, other than income taxes
128.2

 
—

 
—

 
—

 
128.2

Total Gas Utility Operating Expenses
1,388.1

 
—

 
—

 
(59.2
)
 
1,328.9

Gas Marketing and Other
—

 
27.6

 
19.4

 
50.6

 
97.6

Total Operating Expenses
1,388.1

 
27.6

 
19.4

 
(8.6
)
 
1,426.5

Operating Income (Loss)
$
279.5

 
$
27.7

 
$
(7.9
)
 
$
—

 
$
299.3

Net Economic Earnings (Loss)
$
208.1

 
$
18.2

 
$
(16.0
)
 
$
—

 
$
210.3

 
 
 
 
 
 
 
 
 
 
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

The Company’s total assets by segment were as follows:
 
June 30,
 
September 30,
 
June 30,
 
2018
 
2017
 
2017
Total Assets:
Gas Utility
$
5,445.5

 
$
5,551.2

 
$
5,323.1

Gas Marketing
234.5

 
246.2

 
223.6

Other
2,135.9

 
2,239.5

 
2,171.8

Eliminations
(1,231.0
)
 
(1,490.2
)
 
(1,420.3
)
Total Assets
$
6,584.9

 
$
6,546.7

 
$
6,298.2
Schedule of 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,
 
2018
 
2017
 
2018
 
2017
Net Income
$
25.9

 
$
21.7

 
$
240.1

 
$
174.9

Adjustments, pre-tax:
 
 
 
 
 
 
 
Missouri regulatory adjustments
—

 
—

 
30.6

 
—

Unrealized (gain) loss on energy-related derivative contracts
(16.0
)
 
(2.2
)
 
(3.4
)
 
3.2

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

 
—

 
(0.3
)
 
(0.2
)
Acquisition, divestiture and restructuring activities
3.3

 
1.9

 
7.0

 
2.1

Income tax effect of adjustments
2.0

 
0.2

 
(9.7
)
 
(1.9
)
Effects of the Tax Cuts and Jobs Act
—

 
—

 
(54.0
)
 
—

Net Economic Earnings
$
15.2

 
$
21.6

 
$
210.3

 
$
178.1