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Investment in Unconsolidated Affiliates (Tables)
 9 Months Ended
Sep. 30, 2019
Reconciliation of Basis Difference [Line Items]  
Reconciliation of Basis Difference [Table Text Block]
The following table reconciles the difference between OGE Energy's investment in Enable and its underlying equity in the net assets of Enable (basis difference) from December 31, 2018 to September 30, 2019.
(In millions)
 
 
Basis difference at December 31, 2018
 
$
680.3

Amortization of basis difference (A)
 
(20.5
)
Basis difference at September 30, 2019
 
$
659.8

(A) Includes proportional basis difference recognition due to dilution.
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 nine months ended September 30, 2019 and 2018.
 
Three Months Ended
Nine Months Ended
 
September 30,
September 30,
(In millions)
2019
2018
2019
2018
Enable net income
$
123.0

$
129.0

$
351.0

$
320.0

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

—

0.1

—

Enable net income used to calculate OGE Energy's equity in earnings
$
123.0

$
129.0

$
351.1

$
320.0

OGE Energy's percent ownership at period end
25.5
%
25.6
%
25.5
%
25.6
%
OGE Energy's portion of Enable net income
$
31.2

$
33.0

$
89.4

$
82.0

Amortization of basis difference and dilution recognition (A)
7.1

7.1

15.4

21.3

Equity in earnings of unconsolidated affiliates
$
38.3

$
40.1

$
104.8

$
103.3


(A) Includes loss on dilution, net of proportional basis difference recognition.
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, 2019 and 2018.
 
Three Months Ended
Nine Months Ended
 
September 30,
September 30,
(In millions)
2019
2018
2019
2018
Operating revenues:
 
 
 
 
Electricity to power electric compression assets
$
4.5

$
4.7

$
12.1

$
12.2

Cost of sales:
 
 
 
 
Natural gas transportation services
$
9.4

$
8.8

$
33.5

$
26.3

Natural gas (sales) purchases
$
(1.1
)
$
0.1

$
(5.4
)
$
2.6
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, 2019 and December 31, 2018 and for the three and nine months ended September 30, 2019 and 2018.
 
September 30,
December 31,
Balance Sheet
2019
2018
(In millions)
 
Current assets
$
417

$
449

Non-current assets
$
12,018

$
11,995

Current liabilities
$
819

$
1,615

Non-current liabilities
$
4,076

$
3,211
Summarized Income Statement Financial Information, Equity Method Investment [Table Text Block]
 
Three Months Ended
Nine Months Ended
 
September 30,
September 30,
Income Statement
2019
2018
2019
2018
(In millions)
 
Total revenues
$
699

$
928

$
2,229

$
2,481

Cost of natural gas and NGLs
$
263

$
516

$
958

$
1,335

Operating income
$
175

$
171

$
507

$
436

Net income
$
123

$
129

$
351

$
320