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Investment in Unconsolidated Affiliates (Tables)
 9 Months Ended
Sep. 30, 2017
Reconciliation of Basis Difference [Line Items]  
Reconciliation of Basis Difference [Table Text Block]
The following table reconciles the basis difference in Enable from December 31, 2016 to September 30, 2017.
(In millions)
 
 
Basis difference as of December 31, 2016
 
$
743.7

Change in Enable basis difference
 
(0.9
)
Amortization of basis difference
 
(8.5
)
Elimination of Enable fair value step up
 
(12.9
)
Basis difference as of September 30, 2017
 
$
721.4
Reconciliation of Equity in Earnings of Unconsolidated Affiliates [Table Text Block]
The following table reconciles the Company's equity in earnings of its unconsolidated affiliates for the three and nine months ended September 30, 2017 and 2016.

Three Months Ended
Nine Months Ended

September 30,
September 30,
Reconciliation of Equity in Earnings of Unconsolidated Affiliates
2017
2016
2017
2016
(In millions)


Enable net income
$
104.0

$
110.1

$
301.0

$
230.8

Distributions senior to limited partners
—

(9.1
)
—

(9.1
)
Differences due to timing of OGE Energy and Enable accounting close
—

3.0

—

(7.2
)
Enable net income used to calculate OGE Energy's equity in earnings
$
104.0

$
104.0

$
301.0

$
214.5

OGE Energy's percent ownership at period end
25.7
%
26.3
%
25.7
%
26.3
%
OGE Energy's portion of Enable net income
$
26.5

$
27.3

$
77.2

$
55.9

Impairments recognized by Enable associated with OGE Energy's basis differences
—

—

—

1.8

OGE Energy's share of Enable net income
$
26.5

$
27.3

$
77.2

$
57.7

Amortization of basis difference
2.8

2.9

8.5

8.8

Elimination of Enable fair value step up
4.3

4.3

12.9

13.0

Equity in earnings of unconsolidated affiliates
$
33.6

$
34.5

$
98.6

$
79.5
Schedule of Related Party Transactions [Table Text Block]
The following table summarizes related party transactions between OG&E and Enable during the three and nine months ended September 30, 2017 and 2016.
 
Three Months Ended
Nine Months Ended
 
September 30,
September 30,
(In millions)
2017
2016
2017
2016
Operating revenues:
 
 
 
 
Electricity to power electric compression assets
$
4.5

$
3.7

$
10.0

$
9.0

Cost of sales:
 
 
 
 
Natural gas transportation services
$
8.8

$
8.8

$
26.3

$
26.3

Natural gas purchases (sales)
0.4

4.4

(0.4
)
11.3
Summarized Balance Sheet Financial Information, Equity Method Investment [Table Text Block]
Summarized unaudited financial information for 100 percent of Enable is presented below at September 30, 2017 and December 31, 2016 and for the three and nine months ended September 30, 2017 and 2016.
 
September 30,
December 31,
Balance Sheet
2017
2016
(In millions)
 
Current assets
$
446

$
396

Non-current assets
10,816

10,816

Current liabilities
831

362

Non-current liabilities
2,740

3,056
Summarized Income Statement Financial Information, Equity Method Investment [Table Text Block]
 
Three Months Ended
Nine Months Ended
 
September 30,
September 30,
Income Statement
2017
2016
2017
2016
(In millions)
 
Operating revenues
$
705

$
620

$
1,997

$
1,658

Cost of natural gas and NGLs
349

268

936

717

Operating income
137

139

399

299

Net income
104

110

301

231