CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Net income	$ 363.6	$ 300.4	$ 261.1
Pension Plan and Restoration of Retirement Income Plan:
Amortization of deferred net loss, net of tax of $1.4 million, $1.2 million and $2.0 million, respectively	2.5	1.3	3.2
Net gain (loss) arising during the period, net of tax of ($6.7) million, $4.4 million and $0.4 million, respectively	(13.5)	7.6	0.6
Amortization of prior service cost, net of tax of $0.2 million, $0.1 million and $0.1 million, respectively	0.4	0.2	0.1
Prior service cost arising during the period, net of tax of $0, $0 and ($0.2) million, respectively	0	0	(0.3)
Postretirement plans:
Amortization of deferred net loss, net of tax of ($1.6) million, $0.6 million and $0.7 million, respectively	1.8	1.2	0.9
Net loss arising during the period, net of tax of ($3.1) million, ($2.4) million and ($4.1) million, respectively	(3.6)	(4.1)	(6.3)
Amortization of deferred net transition obligation, net of tax of $0.1 million, $0.1 million and $0.1 million, respectively	0.2	0.1	0.1
Amortization of prior service cost, net of tax of ($1.6) million, $0.1 million and $0.1 million, respectively	(1.8)	0	0.2
Prior service cost arising during the period, net of tax of $9.5 million, $0 and $0, respectively	10.8	0	0
Deferred commodity contracts hedging losses reclassified in net income, net of tax of $12.6 million, $9.9 million and $4.7 million, respectively	27.6	18.5	7.5
Deferred commodity contracts hedging gains (losses), net of tax of ($1.7) million, ($8.5) million and ($42.6) million, respectively	(4.8)	(16.3)	(67.3)
Deferred interest rate swaps hedging gains, net of tax of $0.2 million, $0.2 million and $0.2 million, respectively	0.3	0.2	0.3
Other comprehensive income (loss), net of tax	19.9	8.7	(61.0)
Comprehensive income (loss)	383.5	309.1	200.1
Less: Comprehensive income attributable to noncontrolling interest for sale of equity investment	(3.2)	(6.2)	0
Less: Comprehensive income attributable to noncontrolling interests	24.2	5.5	2.8
Total comprehensive income (loss) attributable to OGE Energy	$ 362.5	$ 309.8	$ 197.3