CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Net income	$ 215.2	$ 192.4	$ 336.2	$ 341.5
Pension Plan and Restoration of Retirement Income Plan:
Amortization of deferred net loss, net of tax of $0.6, $0.4, $1.8 and $1.3, respectively	0.9	0.8	2.8	2.3
Amortization of prior service cost, net of tax of $0, $0, $0 and $0.1, respectively	0	0	0	0.1
Postretirement Benefit Plans:
Amortization of deferred net loss, net of tax of $0.3, $0.2, $0.9 and $0.8, respectively	0.6	0.5	1.6	1.5
Amortization of deferred net transition obligation, net of tax of $0, $0.1, $0 and $0.1, respectively	0	0.1	0	0.1
Amortization of prior service cost, net of tax of $(0.3), ($0.3), $(0.8) and ($0.8), respectively	(0.5)	(0.5)	(1.4)	(1.4)
Deferred commodity contracts hedging gains reclassified in net income, net of tax of $0.3, $0, $0.2 and ($1.6), respectively	0.3	0	0.2	(3.6)
Deferred commodity contracts hedging losses, net of tax of $0, ($0.3), $0 and ($0.5), respectively	0	(0.5)	0	(0.5)
Amortization of deferred interest rate swap hedging losses, net of tax of $0, $0, $0.1 and $0.1, respectively	0.1	0.1	0.2	0.2
Other comprehensive income (loss), net of tax	1.4	0.5	3.4	(1.3)
Comprehensive income (loss)	216.6	192.9	339.6	340.2
Less: Comprehensive income attributable to noncontrolling interests	0	6.9	6.3	24.1
Less: Deconsolidation of Enogex Holdings	0	0	6.1	0
Total comprehensive income attributable to OGE Energy	$ 216.6	$ 186.0	$ 327.2	$ 316.1