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Report of Business Segments (Tables)
 9 Months Ended
Sep. 30, 2015
Segment Reporting [Abstract]  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
The following tables summarize the results of the Company's business segments during the three and nine months ended September 30, 2016 and 2015.
Three Months Ended September 30, 2016
Electric Utility
Natural Gas Midstream Operations
Other Operations
Eliminations
Total
(In millions)
 
 
 
 
 
Operating revenues
$
743.9

$
—

$
—

$
—

$
743.9

Cost of sales
269.8

—

—

—

269.8

Other operation and maintenance
115.2

(0.1
)
(2.0
)
—

113.1

Depreciation and amortization
80.8

—

1.4

—

82.2

Taxes other than income
20.9

—

0.6

—

21.5

Operating income
257.2

0.1

—

—

257.3

Equity in earnings of unconsolidated affiliates
—

34.5

—

—

34.5

Other income
6.0

—

0.3

—

6.3

Interest expense
34.3

—

1.1

—

35.4

Income tax expense (benefit)
69.0

12.1

(2.0
)
—

79.1

Net income
$
159.9

$
22.5

$
1.2

$
—

$
183.6

Investment in unconsolidated affiliates
$
—

$
1,168.0

$
—

$
—

$
1,168.0

Total assets
$
8,511.5

$
1,503.1

$
93.3

$
(323.9
)
$
9,784.0

Three Months Ended September 30, 2015
Electric Utility
Natural Gas Midstream Operations
Other Operations
Eliminations
Total
(In millions)
 
 
 
 
 
Operating revenues
$
719.8

$
—

$
—

$
—

$
719.8

Cost of sales
259.8

—

—

—

259.8

Other operation and maintenance
107.4

4.9

(2.9
)
—

109.4

Depreciation and amortization
75.9

—

2.0

—

77.9

Taxes other than income
21.0

—

0.9

—

21.9

Operating income
255.7

(4.9
)
—

—

250.8

Equity in earnings of unconsolidated affiliates (A)
—

(71.9
)
—

—

(71.9
)
Other income
6.6

—

(0.7
)
(0.1
)
5.8

Interest expense
36.4

—

0.7

(0.1
)
37.0

Income tax expense (benefit)
63.0

(26.8
)
0.3

—

36.5

Net income
$
162.9

$
(50.0
)
$
(1.7
)
$
—

$
111.2

Investment in unconsolidated affiliates
$
—

$
1,202.2

$
—

$
—

$
1,202.2

Total assets
$
8,554.1

$
1,541.5

$
133.5

$
(628.4
)
$
9,600.7

(A)
The Company recorded a $108.4 million pre-tax charge during the three months ended September 30, 2015 for its share of Enable's goodwill impairment, as adjusted for the basis differences.

Nine Months Ended September 30, 2016
Electric Utility
Natural Gas Midstream Operations
Other Operations
Eliminations
Total
(In millions)
 
 
 
 
 
Operating revenues
$
1,728.4

$
—

$
—

$
—

$
1,728.4

Cost of sales
645.4

—

—

—

645.4

Other operation and maintenance
356.3

7.9

(9.6
)
—

354.6

Depreciation and amortization
235.9

—

4.9

—

240.8

Taxes other than income
63.6

—

2.9

—

66.5

Operating income
427.2

(7.9
)
1.8

—

421.1

Equity in earnings of unconsolidated affiliates
—

79.5

—

—

79.5

Other income
18.3

—

(0.8
)
(0.2
)
17.3

Interest expense
104.8

—

3.1

(0.2
)
107.7

Income tax expense (benefit)
102.4

31.5

(4.0
)
—

129.9

Net income
$
238.3

$
40.1

$
1.9

$
—

$
280.3

Investment in unconsolidated affiliates
$
—

$
1,168.0

$
—

$
—

$
1,168.0

Total assets
$
8,511.5

$
1,503.1

$
93.3

$
(323.9
)
$
9,784.0


Nine Months Ended September 30, 2015
Electric Utility
Natural Gas Midstream Operations
Other Operations
Eliminations
Total
(In millions)
 
 
 
 
 
Operating revenues
$
1,749.8

$
—

$
—

$
—

$
1,749.8

Cost of sales
682.3

—

—

—

682.3

Other operation and maintenance
337.3

5.9

(8.9
)
—

334.3

Depreciation and amortization
224.0

—

6.0

—

230.0

Taxes other than income
65.7

—

3.1

—

68.8

Operating income
440.5

(5.9
)
(0.2
)
—

434.4

Equity in earnings of unconsolidated affiliates (A)
—

(12.0
)
—

—

(12.0
)
Other income
13.9

—

2.6

(0.2
)
16.3

Interest expense
110.5

—

2.1

(0.2
)
112.4

Income tax expense (benefit)
94.9

(8.7
)
(1.8
)
—

84.4

Net income
$
249.0

$
(9.2
)
$
2.1

$
—

$
241.9

Investment in unconsolidated affiliates
$
—

$
1,202.2

$
—

$
—

$
1,202.2

Total assets
$
8,554.1

$
1,541.5

$
133.5

$
(628.4
)
$
9,600.7

(A)
The Company recorded a $108.4 million pre-tax charge during the three months ended September 30, 2015 for its share of Enable's goodwill impairment, as adjusted for the basis differences.