CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Net income	$ 28.0	$ 47.5
Pension Plan and Restoration of Retirement Income Plan:
Amortization of deferred net loss, net of tax of $0.4 and $0.4, respectively	0.9	0.8
Postretirement Benefit Plans:
Amortization of deferred net loss, net of tax of $0.3 and $0.3, respectively	0.5	0.5
Amortization of prior service cost, net of tax of ($0.3) and ($0.3), respectively	(0.5)	(0.5)
Deferred commodity contracts hedging gains reclassified in net income, net of tax of ($0.1) and ($1.7), respectively	(0.1)	(3.3)
Amortization of deferred interest rate swap hedging losses, net of tax of $0.1 and $0.1, respectively	0.1	0.1
Other comprehensive income (loss), net of tax	0.9	(2.4)
Comprehensive income (loss)	28.9	45.1
Less: Comprehensive income attributable to noncontrolling interests	5.0	9.5
Total comprehensive income attributable to OGE Energy	$ 23.9	$ 35.6