CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Net income	$ 271.3	$ 395.8	$ 393.8
Pension Plan and Restoration of Retirement Income Plan:
Amortization of deferred net loss, net of tax of $2.2, $1.2, and $2.4, respectively	2.5	1.8	3.7
Net gain (loss) arising during the period, net of tax of ($5.8), ($7.0), and $7.8, respectively	(9.5)	(11.1)	12.4
Settlement (curtailment) cost, net of tax of $2.9, ($0.1) and $1.9, respectively	4.6	(0.1)	3.0
Postretirement Benefit Plans:
Amortization of deferred net loss, net of tax of $0.8, $0.5, and $1.3, respectively	1.2	0.9	2.0
Net gain (loss) arising during the period, net of tax of $5.6, ($1.9), and $4.4, respectively	9.3	(3.1)	6.9
Amortization of prior service cost, net of tax of ($1.1), ($1.1), and ($1.1), respectively	(1.8)	(1.8)	(1.8)
Deferred commodity contracts hedging losses reclassified in net income, net of tax of $0, $0, and $0.4, respectively	0.0	0.0	0.6
Amortization of deferred interest rate swap hedging losses, net of tax of $0, $0.1, and $0.1, respectively	0.0	0.2	0.3
Other comprehensive income (loss), net of tax	6.3	(13.2)	27.1
Comprehensive income	277.6	382.6	420.9
Less: Comprehensive income attributable to noncontrolling interests	0.0	0.0	6.3
Less: Deconsolidation of Enogex Holdings	0.0	0.0	6.1
Total comprehensive income attributable to OGE Energy	$ 277.6	$ 382.6	$ 408.5