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Investment in Unconsolidated Affiliates (Tables)
 6 Months Ended
Jun. 30, 2018
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, 2017 to June 30, 2018.
(In millions)
 
 
Basis difference at December 31, 2017
 
$
714.2

Change in Enable basis difference
 
(3.1
)
Amortization of basis difference
 
(5.6
)
Elimination of Enable fair value step up
 
(8.6
)
Basis difference at June 30, 2018
 
$
696.9
Reconciliation of Equity in Earnings of Unconsolidated Affiliates [Table Text Block]
The following table reconciles the Company's equity in earnings of unconsolidated affiliates for the three and six months ended June 30, 2018 and 2017.

Three Months Ended
Six Months Ended
 
June 30,
June 30,
(In millions)
2018
2017
2018
2017
Enable net income
$
86.4

$
86.2

$
191.0

$
197.4

OGE Energy's percent ownership at period end
25.6
%
25.7
%
25.6
%
25.7
%
OGE Energy's portion of Enable net income
22.2

22.2

49.0

50.7

Amortization of basis difference
2.8

2.9

5.6

5.7

Elimination of Enable fair value step up
4.3

4.3

8.6

8.6

Equity in earnings of unconsolidated affiliates
$
29.3

$
29.4

$
63.2

$
65.0
Schedule of Related Party Transactions [Table Text Block]
The following table summarizes related party transactions between OG&E and Enable during the three and six months ended June 30, 2018 and 2017.
 
Three Months Ended
Six Months Ended
 
June 30,
June 30,
(In millions)
2018
2017
2018
2017
Operating revenues:
 
 
 
 
Electricity to power electric compression assets
$
3.6

$
3.3

$
7.6

$
5.5

Cost of sales:
 
 
 
 
Natural gas transportation services
$
8.8

$
8.8

$
17.5

$
17.5

Natural gas purchases (sales)
$
2.2

$
(0.4
)
$
2.5

$
(0.8
)
Summarized Balance Sheet Financial Information, Equity Method Investment [Table Text Block]
Summarized unaudited financial information for 100 percent of Enable is presented below at June 30, 2018 and December 31, 2017 and for the three and six months ended June 30, 2018 and 2017.
 
June 30,
December 31,
Balance Sheet
2018
2017
(In millions)
 
Current assets
$
432

$
416

Non-current assets
$
11,360

$
11,177

Current liabilities
$
1,258

$
1,279

Non-current liabilities
$
2,963

$
2,660
Summarized Income Statement Financial Information, Equity Method Investment [Table Text Block]
 
Three Months Ended
Six Months Ended
 
June 30,
June 30,
Income Statement
2018
2017
2018
2017
(In millions)
 
Operating revenues
$
805

$
626

$
1,553

$
1,292

Cost of natural gas and NGLs
$
444

$
279

$
819

$
587

Operating income
$
126

$
122

$
265

$
262

Net income
$
86

$
86

$
191

$
197