Retirement Plans and Postretirement Benefit Plans (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2021		Dec. 31, 2020		Dec. 31, 2019
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Contribution Plan, Employer Matching Contribution, Percent of Match		200.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay		5.00%
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Employer contributions		$ 40.0		$ 20.0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Ultimate Health Care Cost Trend Rate		4.50%
Expected Future Benefit Payments, Next Twelve Months		$ 95.3
Expected Future Benefit Payments, Year Two		37.0
Expected Future Benefit Payments, Year Three		38.4
Expected Future Benefit Payments, Year Four		36.7
Expected Future Benefit Payments, Year Five		35.2
Expected Future Benefit Payments, Five Fiscal Years Thereafter		167.4
Defined Contribution Plan, Cost		15.4		18.2		$ 14.4
Postemployment Benefits Liability		2.0		2.2
Og and E [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Employer contributions		30.0		10.0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Expected Future Benefit Payments, Next Twelve Months		38.8
Expected Future Benefit Payments, Year Two		30.7
Expected Future Benefit Payments, Year Three		30.6
Expected Future Benefit Payments, Year Four		28.7
Expected Future Benefit Payments, Year Five		28.3
Expected Future Benefit Payments, Five Fiscal Years Thereafter		126.6
Defined Contribution Plan, Cost		12.0		14.3		11.0
Postemployment Benefits Liability		1.5		1.8
Pension Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Benefits Paid		(14.1)		(14.2)
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment		0.0		0.0
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit Obligation, Beginning		654.6		616.1
Service cost		11.2		13.2		12.9
Interest cost		13.3		17.0		20.7
Plan curtailments		0.0		0.0
Defined Benefit Plan, Benefit Obligation, Special and Contractual Termination Benefits		0.0		7.6
Plan settlements		(158.6)		(42.8)
Actuarial (gains) losses		(3.5)		57.7
Benefit Obligation, Ending		502.9		654.6		616.1
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets, Beginning		570.3		530.3
Actual return on plans' assets		48.4		77.0
Employer contributions		40.0		20.0
Plan settlements		(158.6)		(42.8)
Fair Value of Plan Assets, Ending		486.0		570.3		530.3
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost		11.2		13.2		12.9
Interest cost		13.3		17.0		20.7
Expected return on plan assets		(34.1)		(37.6)		(36.1)
Defined Benefit Plan, Amortization of Gain (Loss)		(9.4)		(17.1)		(17.3)
Amortization of unrecognized prior service cost	[1]	0.0		0.0		0.0
Curtailment		0.0		0.0		0.0
Defined Benefit Plan, Cost of Providing Special and Contractual Termination Benefits		0.0		7.6		0.0
Settlement cost		41.3		14.1		27.6
Net periodic benefit cost		41.1		31.4		42.4
Amount paid by unconsolidated affiliates	[2]	(0.2)		2.0		2.9
Net Periodic Benefit Cost, Net of Unconsolidated Affiliates		41.3		29.4		39.5
Plan settlements		(158.6)		(42.8)
Capitalized Portion of Net Periodic Benefit Cost		$ 3.4		$ 3.8		$ 3.6
Assumptions Used Calculating Benefit Obligation, Discount Rate		2.75%		2.30%		3.15%
Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets		7.00%		7.50%		7.50%
Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase		4.20%		4.20%		4.20%
Fair Value of Plan Assets, Beginning		$ 570.3		$ 530.3
Defined Benefit Plan, Benefit Obligation, Benefits Paid		(14.1)		(14.2)
Accumulated Benefit Obligation		(475.2)		(610.8)
Pension Plans, Defined Benefit [Member] | Og and E [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Benefits Paid		(11.9)		(12.3)
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit Obligation, Beginning		484.1		462.0
Service cost		7.7		9.2		$ 9.0
Interest cost		9.7		12.6		15.6
Plan curtailments		0.0		0.0
Defined Benefit Plan, Benefit Obligation, Special and Contractual Termination Benefits		0.0		5.1
Plan settlements		(120.4)		(33.5)
Actuarial (gains) losses		(6.0)		41.0
Benefit Obligation, Ending		363.2		484.1		462.0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets, Beginning		420.3		399.1
Actual return on plans' assets		35.0		57.0
Employer contributions		30.0		10.0
Plan settlements		(120.4)		(33.5)
Fair Value of Plan Assets, Ending		353.0		420.3		399.1
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost		7.7		9.2		9.0
Interest cost		9.7		12.6		15.6
Expected return on plan assets		(24.7)		(27.9)		(27.6)
Defined Benefit Plan, Amortization of Gain (Loss)		(7.0)		(12.1)		(12.9)
Amortization of unrecognized prior service cost	[1]	0.0		0.0		0.0
Curtailment		0.0		0.0		0.0
Defined Benefit Plan, Cost of Providing Special and Contractual Termination Benefits		0.0		5.1		0.0
Settlement cost		33.1		11.4		16.4
Net periodic benefit cost		32.8		22.5		26.3
Amount Attributable to Parent	[2]	6.5		5.9		4.5
Net Periodic Benefit Cost, Net of Unconsolidated Affiliates		39.3		28.4		30.8
Plan settlements		(120.4)		(33.5)
Capitalized Portion of Net Periodic Benefit Cost		2.9		3.1		3.0
Fair Value of Plan Assets, Beginning		420.3		399.1
Defined Benefit Plan, Benefit Obligation, Benefits Paid		(11.9)		(12.3)
Accumulated Benefit Obligation		(341.0)		(454.7)
Pension Plans, Defined Benefit [Member] | OKLAHOMA
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Settlement cost	[3]	37.9		21.6		17.9
Additional Pension Expense to Meet State Requirements	[3]	23.0		13.8		16.1
Pension Plans, Defined Benefit [Member] | ARKANSAS
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Settlement cost	[3]	3.5		2.0		1.7
Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets, Beginning		0.0
Fair Value of Plan Assets, Ending		0.0		0.0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Fair Value of Plan Assets, Beginning		0.0
Restoration of Retirement Income Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Benefits Paid		0.0		0.0
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment		1.4		0.0
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit Obligation, Beginning		7.8		10.3
Service cost		0.8		0.8		0.5
Interest cost		0.1		0.2		0.4
Plan curtailments		(0.1)		0.2
Defined Benefit Plan, Benefit Obligation, Special and Contractual Termination Benefits		0.0		0.0
Plan settlements		(4.6)		(5.3)
Actuarial (gains) losses		0.5		1.6
Benefit Obligation, Ending		5.9		7.8		10.3
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets, Beginning		0.0		0.0
Actual return on plans' assets		0.0		0.0
Employer contributions		4.6		5.3
Plan settlements		(4.6)		(5.3)
Fair Value of Plan Assets, Ending		0.0		0.0		0.0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost		0.8		0.8		0.5
Interest cost		0.1		0.2		0.4
Expected return on plan assets		0.0		0.0		0.0
Defined Benefit Plan, Amortization of Gain (Loss)		(0.2)		(0.5)		(0.5)
Amortization of unrecognized prior service cost	[1]	0.1		0.0		0.0
Curtailment		0.0		(0.2)		0.0
Defined Benefit Plan, Cost of Providing Special and Contractual Termination Benefits		0.0		0.0		0.0
Settlement cost		2.1		2.7		0.5
Net periodic benefit cost		3.3		4.4		1.9
Amount paid by unconsolidated affiliates	[2]	0.1		0.1		0.1
Net Periodic Benefit Cost, Net of Unconsolidated Affiliates		3.2		4.3		1.8
Plan settlements		(4.6)		(5.3)
Fair Value of Plan Assets, Beginning		0.0		0.0
Defined Benefit Plan, Benefit Obligation, Benefits Paid		0.0		0.0
Accumulated Benefit Obligation		(5.4)		(6.9)
Restoration of Retirement Income Plan [Member] | Og and E [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Benefits Paid		0.0		0.0
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit Obligation, Beginning		3.0		6.1
Service cost		0.0		0.1		0.2
Interest cost		0.0		0.1		0.2
Plan curtailments		0.0		0.0
Defined Benefit Plan, Benefit Obligation, Special and Contractual Termination Benefits		0.0		0.0
Plan settlements		(2.9)		(4.5)
Actuarial (gains) losses		0.4		1.2
Benefit Obligation, Ending		0.5		3.0		6.1
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets, Beginning		0.0		0.0
Actual return on plans' assets		0.0		0.0
Employer contributions		2.9		4.5
Plan settlements		(2.9)		(4.5)
Fair Value of Plan Assets, Ending		0.0		0.0		0.0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost		0.0		0.1		0.2
Interest cost		0.0		0.1		0.2
Expected return on plan assets		0.0		0.0		0.0
Defined Benefit Plan, Amortization of Gain (Loss)		(0.1)		(0.4)		(0.3)
Amortization of unrecognized prior service cost	[1]	0.0		0.0		0.0
Curtailment		0.0		0.0		0.0
Defined Benefit Plan, Cost of Providing Special and Contractual Termination Benefits		0.0		0.0		0.0
Settlement cost		1.6		2.4		0.5
Net periodic benefit cost		1.7		3.0		1.2
Amount Attributable to Parent	[2]	1.5		1.3		0.5
Net Periodic Benefit Cost, Net of Unconsolidated Affiliates		3.2		4.3		1.7
Plan settlements		(2.9)		(4.5)
Fair Value of Plan Assets, Beginning		0.0		0.0
Defined Benefit Plan, Benefit Obligation, Benefits Paid		0.0		0.0
Accumulated Benefit Obligation		(0.4)		(2.9)
Other Postretirement Benefits Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Benefits Paid		(12.5)		(11.0)
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment		0.0		0.0
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit Obligation, Beginning		144.5		136.5
Service cost		0.2		0.2		0.2
Interest cost		3.4		4.2		5.6
Plan curtailments		1.9		4.0
Defined Benefit Plan, Plan Assets, Contributions by Plan Participant		(3.5)		(3.3)
Actuarial (gains) losses		(3.7)		7.3
Benefit Obligation, Ending		137.3		144.5		136.5
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets, Beginning		47.6		47.0
Actual return on plans' assets		(0.5)		1.2
Employer contributions		6.2		7.1
Fair Value of Plan Assets, Ending		44.3		47.6		47.0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost		0.2		0.2		0.2
Interest cost		3.4		4.2		5.6
Expected return on plan assets		(1.8)		(1.8)		(1.9)
Defined Benefit Plan, Amortization of Gain (Loss)		(2.8)		(2.0)		(2.0)
Amortization of unrecognized prior service cost	[1]	(6.9)		(8.4)		(8.4)
Curtailment		0.0		(1.5)		0.0
Net periodic benefit cost		(2.3)		(2.3)		(2.5)
Amount paid by unconsolidated affiliates	[4]	(0.5)		(0.7)		(0.6)
Net Periodic Benefit Cost, Net of Unconsolidated Affiliates		(1.8)		(1.6)		(1.9)
Capitalized Portion of Net Periodic Benefit Cost		$ 0.2		$ 0.2		$ 0.2
Assumptions Used Calculating Benefit Obligation, Discount Rate		2.80%		2.45%		3.25%
Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets		4.00%		4.00%		4.00%
Health Care Cost Trend Rate Assumed for Next Fiscal Year		6.50%
Fair Value of Plan Assets, Beginning		$ 47.6		$ 47.0
Defined Benefit Plan, Benefit Obligation, Contributions by Plan Participant		3.5		3.3
Defined Benefit Plan, Benefit Obligation, Benefits Paid		(12.5)		(11.0)
Accumulated Benefit Obligation		(93.0)		(96.9)
Other Postretirement Benefits Plan [Member] | Og and E [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Benefits Paid		(9.9)		(8.6)
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit Obligation, Beginning		109.5		104.7
Service cost		0.1		0.2		$ 0.2
Interest cost		2.6		3.2		4.3
Plan curtailments		0.0		3.1
Defined Benefit Plan, Plan Assets, Contributions by Plan Participant		(2.6)		(2.4)
Actuarial (gains) losses		(2.5)		4.5
Benefit Obligation, Ending		102.4		109.5		104.7
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets, Beginning		42.7		41.9
Actual return on plans' assets		(0.5)		1.1
Employer contributions		5.0		5.9
Fair Value of Plan Assets, Ending		39.9		42.7		41.9
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost		0.1		0.2		0.2
Interest cost		2.6		3.2		4.3
Expected return on plan assets		(1.7)		(1.7)		(1.7)
Defined Benefit Plan, Amortization of Gain (Loss)		(2.7)		(2.1)		(2.1)
Amortization of unrecognized prior service cost	[1]	(5.0)		(6.1)		(6.1)
Curtailment		0.0		(1.3)		0.0
Net periodic benefit cost		(1.3)		(1.0)		(1.2)
Amount Attributable to Parent	[4]	(0.5)		(0.5)		(0.6)
Net Periodic Benefit Cost, Net of Unconsolidated Affiliates		(1.8)		(1.5)		(1.8)
Capitalized Portion of Net Periodic Benefit Cost		0.1		0.1		0.1
Fair Value of Plan Assets, Beginning		42.7		41.9
Defined Benefit Plan, Benefit Obligation, Contributions by Plan Participant		2.6		2.4
Defined Benefit Plan, Benefit Obligation, Benefits Paid		(9.9)		(8.6)
Accumulated Benefit Obligation		(62.5)		(66.8)
Other Postretirement Benefits Plan [Member] | OKLAHOMA
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Settlement cost	[5]	0.0		(1.4)		0.0
Additional Pension Expense to Meet State Requirements	[5]	0.4		0.2		1.0
Other Postretirement Benefits Plan [Member] | ARKANSAS
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Settlement cost	[5]	0.0		(0.1)		$ 0.0
Other Postretirement Benefits Plan [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets, Beginning		14.2
Fair Value of Plan Assets, Ending		16.2		14.2
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Fair Value of Plan Assets, Beginning		14.2
Other Postretirement Benefits Plan [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets, Beginning		0.0
Fair Value of Plan Assets, Ending		0.0		0.0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Fair Value of Plan Assets, Beginning		0.0
Other Postretirement Benefits Plan [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets, Beginning		33.4
Fair Value of Plan Assets, Ending		28.1		33.4
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Fair Value of Plan Assets, Beginning		33.4
Other Postretirement Benefits Plan [Member] | Fair Value, Inputs, Level 1, 2 and 3 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets, Beginning		47.6
Fair Value of Plan Assets, Ending		44.3		47.6
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Fair Value of Plan Assets, Beginning		47.6
Other Postretirement Benefits Plan [Member] | Fair Value, Inputs, Level 1, 2 and 3 [Member] | Og and E [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets, Beginning		42.7
Fair Value of Plan Assets, Ending		39.9		42.7
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Fair Value of Plan Assets, Beginning		$ 42.7
Less Than 90% [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Projected Benefit Obligation Funded Status Thresholds Fixed Income		50.00%
Projected Benefit Obligation Funded Status Thresholds Equity		50.00%
Projected Benefit Obligation Funded Status Thresholds		100.00%
95% [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Projected Benefit Obligation Funded Status Thresholds Fixed Income		58.00%
Projected Benefit Obligation Funded Status Thresholds Equity		42.00%
Projected Benefit Obligation Funded Status Thresholds		100.00%
100% [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Projected Benefit Obligation Funded Status Thresholds Fixed Income		65.00%
Projected Benefit Obligation Funded Status Thresholds Equity		35.00%
Projected Benefit Obligation Funded Status Thresholds		100.00%
105% [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Projected Benefit Obligation Funded Status Thresholds Fixed Income		73.00%
Projected Benefit Obligation Funded Status Thresholds Equity		27.00%
Projected Benefit Obligation Funded Status Thresholds		100.00%
110% [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Projected Benefit Obligation Funded Status Thresholds Fixed Income		80.00%
Projected Benefit Obligation Funded Status Thresholds Equity		20.00%
Projected Benefit Obligation Funded Status Thresholds		100.00%
115% [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Projected Benefit Obligation Funded Status Thresholds Fixed Income		85.00%
Projected Benefit Obligation Funded Status Thresholds Equity		15.00%
Projected Benefit Obligation Funded Status Thresholds		100.00%
120% [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Projected Benefit Obligation Funded Status Thresholds Fixed Income		90.00%
Projected Benefit Obligation Funded Status Thresholds Equity		10.00%
Projected Benefit Obligation Funded Status Thresholds		100.00%
Domestic All-Cap/Large Cap Equity [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Target Plan Asset Allocations		40.00%
Domestic Mid-Cap Equity [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Target Plan Asset Allocations		15.00%
Domestic Small-Cap Equity [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Target Plan Asset Allocations		25.00%
International Equity [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Target Plan Asset Allocations		20.00%
Minimum [Member] | Domestic All-Cap/Large Cap Equity [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Target Plan Asset Allocations		35.00%
Minimum [Member] | Domestic Mid-Cap Equity [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Target Plan Asset Allocations		5.00%
Minimum [Member] | Domestic Small-Cap Equity [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Target Plan Asset Allocations		5.00%
Minimum [Member] | International Equity [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Target Plan Asset Allocations		10.00%
Maximum [Member] | Domestic All-Cap/Large Cap Equity [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Target Plan Asset Allocations		60.00%
Maximum [Member] | Domestic Mid-Cap Equity [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Target Plan Asset Allocations		25.00%
Maximum [Member] | Domestic Small-Cap Equity [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Target Plan Asset Allocations		30.00%
Maximum [Member] | International Equity [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Target Plan Asset Allocations		30.00%
Group Retiree Medical Insurance Contract [Member] | Other Postretirement Benefits Plan [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets, Beginning		$ 33.4
Fair Value of Plan Assets, Ending		28.1		33.4
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Fair Value of Plan Assets, Beginning		33.4
Group Retiree Medical Insurance Contract [Member] | Other Postretirement Benefits Plan [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets, Beginning		0.0
Fair Value of Plan Assets, Ending		0.0		0.0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Fair Value of Plan Assets, Beginning		0.0
Group Retiree Medical Insurance Contract [Member] | Other Postretirement Benefits Plan [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets, Beginning		33.4
Fair Value of Plan Assets, Ending		28.1		33.4
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Fair Value of Plan Assets, Beginning		33.4
U.S. common stocks [Member] | Pension Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Alternative Investment		0.0	[6]	0.0	[7]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets, Beginning		252.3
Fair Value of Plan Assets, Ending		86.1		252.3
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Fair Value of Plan Assets, Beginning		252.3
U.S. common stocks [Member] | Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets, Beginning		252.3
Fair Value of Plan Assets, Ending		86.1		252.3
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Fair Value of Plan Assets, Beginning		252.3
U.S. common stocks [Member] | Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets, Beginning		0.0
Fair Value of Plan Assets, Ending		0.0		0.0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Fair Value of Plan Assets, Beginning		0.0
U.S. treasury notes and bonds [Member] | Pension Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Alternative Investment		0.0	[6],[8]	0.0	[7],[9]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets, Beginning	[9]	134.3
Fair Value of Plan Assets, Ending		135.2	[8]	134.3	[9]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Fair Value of Plan Assets, Beginning	[9]	134.3
U.S. treasury notes and bonds [Member] | Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets, Beginning	[9]	134.3
Fair Value of Plan Assets, Ending		135.2	[8]	134.3	[9]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Fair Value of Plan Assets, Beginning	[9]	134.3
U.S. treasury notes and bonds [Member] | Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets, Beginning	[9]	0.0
Fair Value of Plan Assets, Ending		0.0	[8]	0.0	[9]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Fair Value of Plan Assets, Beginning	[9]	0.0
Mortgage-backed securities | Pension Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Alternative Investment		0.0	[6]	0.0	[7]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets, Beginning		29.3
Fair Value of Plan Assets, Ending		24.6		29.3
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Fair Value of Plan Assets, Beginning		29.3
Mortgage-backed securities | Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets, Beginning		0.0
Fair Value of Plan Assets, Ending		0.0		0.0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Fair Value of Plan Assets, Beginning		0.0
Mortgage-backed securities | Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets, Beginning		29.3
Fair Value of Plan Assets, Ending		24.6		29.3
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Fair Value of Plan Assets, Beginning		29.3
Corporate fixed income and other securities [Member] | Pension Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Alternative Investment		0.0	[6]	0.0	[7]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets, Beginning		116.6
Fair Value of Plan Assets, Ending		107.0		116.6
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Fair Value of Plan Assets, Beginning		116.6
Corporate fixed income and other securities [Member] | Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets, Beginning		0.0
Fair Value of Plan Assets, Ending		0.0		0.0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Fair Value of Plan Assets, Beginning		0.0
Corporate fixed income and other securities [Member] | Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets, Beginning		116.6
Fair Value of Plan Assets, Ending		107.0		116.6
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Fair Value of Plan Assets, Beginning		116.6
Commingled fund [Member] | Pension Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Alternative Investment		23.6	[6],[10]	25.4	[7],[11]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets, Beginning	[11]	25.4
Fair Value of Plan Assets, Ending		23.6	[10]	25.4	[11]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Fair Value of Plan Assets, Beginning	[11]	25.4
Commingled fund [Member] | Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets, Beginning	[11]	0.0
Fair Value of Plan Assets, Ending		0.0	[10]	0.0	[11]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Fair Value of Plan Assets, Beginning	[11]	0.0
Commingled fund [Member] | Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets, Beginning	[11]	0.0
Fair Value of Plan Assets, Ending		0.0	[10]	0.0	[11]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Fair Value of Plan Assets, Beginning	[11]	0.0
Foreign government bonds [Member] | Pension Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Alternative Investment		0.0	[6]	0.0	[7]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets, Beginning		4.6
Fair Value of Plan Assets, Ending		0.9		4.6
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Fair Value of Plan Assets, Beginning		4.6
Foreign government bonds [Member] | Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets, Beginning		0.0
Fair Value of Plan Assets, Ending		0.0		0.0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Fair Value of Plan Assets, Beginning		0.0
Foreign government bonds [Member] | Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets, Beginning		4.6
Fair Value of Plan Assets, Ending		0.9		4.6
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Fair Value of Plan Assets, Beginning		4.6
Municipal bonds [Member] | Pension Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Alternative Investment		0.0	[6]	0.0	[7]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets, Beginning		1.8
Fair Value of Plan Assets, Ending		1.4		1.8
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Fair Value of Plan Assets, Beginning		1.8
Municipal bonds [Member] | Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets, Beginning		0.0
Fair Value of Plan Assets, Ending		0.0		0.0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Fair Value of Plan Assets, Beginning		0.0
Municipal bonds [Member] | Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets, Beginning		1.8
Fair Value of Plan Assets, Ending		1.4		1.8
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Fair Value of Plan Assets, Beginning		1.8
Money market funds [Member] | Pension Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Alternative Investment		5.5	[6]	8.8	[7]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets, Beginning		8.8
Fair Value of Plan Assets, Ending		5.5		8.8
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Fair Value of Plan Assets, Beginning		8.8
Money market funds [Member] | Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets, Beginning		0.0
Fair Value of Plan Assets, Ending		0.0		0.0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Fair Value of Plan Assets, Beginning		0.0
Money market funds [Member] | Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets, Beginning		0.0
Fair Value of Plan Assets, Ending		0.0		0.0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Fair Value of Plan Assets, Beginning		0.0
Mutual fund [Member] | Pension Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Alternative Investment		0.0	[6]	0.0	[7]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets, Beginning		9.2
Fair Value of Plan Assets, Ending		99.8		9.2
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Fair Value of Plan Assets, Beginning		9.2
Mutual fund [Member] | Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets, Beginning		9.2
Fair Value of Plan Assets, Ending		99.8		9.2
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Fair Value of Plan Assets, Beginning		9.2
Mutual fund [Member] | Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets, Beginning		0.0
Fair Value of Plan Assets, Ending		0.0		0.0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Fair Value of Plan Assets, Beginning		0.0
Cash collateral [Member] | Pension Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Alternative Investment		0.0	[6]	0.0	[7]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets, Beginning		0.7
Fair Value of Plan Assets, Ending		0.6		0.7
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Fair Value of Plan Assets, Beginning		0.7
Cash collateral [Member] | Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets, Beginning		0.7
Fair Value of Plan Assets, Ending		0.6		0.7
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Fair Value of Plan Assets, Beginning		0.7
Cash collateral [Member] | Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets, Beginning		0.0
Fair Value of Plan Assets, Ending		0.0		0.0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Fair Value of Plan Assets, Beginning		0.0
Receivable (foreign currency) [Member] | Pension Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Alternative Investment		0.0	[6]	0.0	[7]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets, Beginning		0.1
Fair Value of Plan Assets, Ending		0.1		0.1
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Fair Value of Plan Assets, Beginning		0.1
Receivable (foreign currency) [Member] | Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets, Beginning		0.0
Fair Value of Plan Assets, Ending		0.0		0.0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Fair Value of Plan Assets, Beginning		0.0
Receivable (foreign currency) [Member] | Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets, Beginning		0.1
Fair Value of Plan Assets, Ending		0.1		0.1
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Fair Value of Plan Assets, Beginning		0.1
Preferred stocks (foreign) [Member] | Pension Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Alternative Investment		0.0	[6]	0.0	[7]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets, Beginning		0.6
Fair Value of Plan Assets, Ending		1.1		0.6
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Fair Value of Plan Assets, Beginning		0.6
Preferred stocks (foreign) [Member] | Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets, Beginning		0.6
Fair Value of Plan Assets, Ending		1.1		0.6
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Fair Value of Plan Assets, Beginning		0.6
Preferred stocks (foreign) [Member] | Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets, Beginning		0.0
Fair Value of Plan Assets, Ending		0.0		0.0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Fair Value of Plan Assets, Beginning		0.0
Total Plan investments [Member] | Pension Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Alternative Investment		29.1	[6]	34.2	[7]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets, Beginning		583.7
Fair Value of Plan Assets, Ending		485.9		583.7
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Fair Value of Plan Assets, Beginning		583.7
Total Plan investments [Member] | Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets, Beginning		397.1
Fair Value of Plan Assets, Ending		322.8		397.1
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Fair Value of Plan Assets, Beginning		397.1
Total Plan investments [Member] | Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets, Beginning		152.4
Fair Value of Plan Assets, Ending		134.0		152.4
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Fair Value of Plan Assets, Beginning		152.4
Receivable from broker for securities sold [Member] | Pension Plans, Defined Benefit [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets, Beginning		0.2
Fair Value of Plan Assets, Ending				0.2
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Fair Value of Plan Assets, Beginning		0.2
Interest and dividends receivable [Member] | Pension Plans, Defined Benefit [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets, Beginning		2.2
Fair Value of Plan Assets, Ending		2.1		2.2
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Fair Value of Plan Assets, Beginning		2.2
Payable to broker for securities purchased [Member] | Pension Plans, Defined Benefit [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets, Beginning		(15.8)
Fair Value of Plan Assets, Ending		(2.0)		(15.8)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Fair Value of Plan Assets, Beginning		(15.8)
Total Plan assets [Member] | Pension Plans, Defined Benefit [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets, Beginning		570.3
Fair Value of Plan Assets, Ending		486.0		570.3
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Fair Value of Plan Assets, Beginning		570.3
Total Plan assets [Member] | Pension Plans, Defined Benefit [Member] | Og and E [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets, Beginning		420.3
Fair Value of Plan Assets, Ending		353.0		420.3
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Fair Value of Plan Assets, Beginning		420.3
Plan Assets Attributable to Affiliates | Pension Plans, Defined Benefit [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets, Beginning		(150.0)
Fair Value of Plan Assets, Ending		(133.0)		$ (150.0)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Fair Value of Plan Assets, Beginning		$ (150.0)

[1] Unamortized prior service cost is amortized on a straight-line basis over the average remaining service period to the first eligibility age of participants who are expected to receive a benefit and are active at the date of the plan amendment.

[2] "Amount paid by unconsolidated affiliates" is only applicable to OGE Energy. "Amount allocated from OGE Energy" is only applicable to OG&E.

[3] Included in the pension regulatory asset or liability in each jurisdiction, as indicated in the regulatory assets and liabilities table in Note 1.

[4] "Amount paid by unconsolidated affiliates" is only applicable to OGE Energy. "Amount allocated from OGE Energy" is only applicable to OG&E.

[5] Included in the pension regulatory asset or liability in each jurisdiction, as indicated in the regulatory assets and liabilities table in Note 1.

[6] GAAP allows the measurement of certain investments that do not have a readily determinable fair value at the net asset value. These investments do not consider the observability of inputs; therefore, they are not included within the fair value hierarchy.

[7] GAAP allows the measurement of certain investments that do not have a readily determinable fair value at the net asset value. These investments do not consider the observability of inputs; therefore, they are not included within the fair value hierarchy.

[8] This category represents U.S. Treasury notes and bonds with a Moody's Investors Service rating of Aaa and Government Agency Bonds with a Moody's Investors Service rating of A1 or higher.

[9] This category represents U.S. Treasury notes and bonds with a Moody's Investors Service rating of Aaa and Government Agency Bonds with a Moody's Investors Service rating of A1 or higher.

[10] This category represents units of participation in a commingled fund that primarily invested in stocks of international companies and emerging markets.

[11] This category represents units of participation in a commingled fund that primarily invested in stocks of international companies and emerging markets.