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Retirement Plans and Postretirement Benefit Plans - Schedule of Accumulated Benefit Obligations in Excess of Fair Value of Plan Assets (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |
Employer contributions |  | $ 40.0 |
Og and E [Member] |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |
Employer contributions |  | 30.0 |
Pension Plans [Member] |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |
Benefit Obligation, Beginning | $ 502.9 | 654.6 |
Service cost | 7.6 | 11.2 |
Interest cost | 15.7 | 13.3 |
Plan settlements | (95.8) | (158.6) |
Plan amendments | 0.0 | 0.0 |
Plan curtailments | 0.0 | 0.0 |
Actuarial (gains) losses | (56.9) | (3.5) |
Benefits paid | (15.0) | (14.1) |
Benefit Obligation, Ending | 358.5 | 502.9 | $ 654.6
Pension Plans [Member] | Og and E [Member] |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |
Benefit Obligation, Beginning | 363.2 | 484.1 |
Service cost | 6.2 | 7.7 |
Interest cost | 12.1 | 9.7 |
Plan settlements | (38.8) | (120.4) |
Plan amendments | 0.0 | 0.0 |
Plan curtailments | 0.0 | 0.0 |
Actuarial (gains) losses | (41.3) | (6.0) |
Benefits paid | (12.9) | (11.9) |
Benefit Obligation, Ending | 288.5 | 363.2 | 484.1
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |
Fair Value of Plan Assets, Beginning | 353.0 | 420.3 |
Actual return on plans' assets | (62.4) | 35.0 |
Employer contributions | 0.0 | 30.0 |
Plan settlements | (38.8) | (120.4) |
Benefits paid | (12.9) | (11.9) |
Fair Value of Plan Assets, Ending | 238.9 | 353.0 | 420.3
Funded status at end of year | (49.6) | (10.2) |
Accumulated Benefit Obligation | (275.2) | (341.0) |
Pension Plans, Defined Benefit [Member] |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |
Service cost | 7.6 | 11.2 | 13.2
Interest cost | 15.7 | 13.3 | 17.0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |
Fair Value of Plan Assets, Beginning | 486.0 | 570.3 |
Actual return on plans' assets | (82.2) | 48.4 |
Employer contributions | 0.0 | 40.0 |
Plan settlements | (95.8) | (158.6) |
Benefits paid | (15.0) | (14.1) |
Fair Value of Plan Assets, Ending | 293.0 | 486.0 | 570.3
Funded status at end of year | (65.5) | (16.9) |
Accumulated Benefit Obligation | (342.7) | (475.2) |
Pension Plans, Defined Benefit [Member] | Og and E [Member] |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |
Service cost | 6.2 | 7.7 | 9.2
Interest cost | 12.1 | 9.7 | 12.6
Restoration of Retirement Income Plan [Member] |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |
Benefit Obligation, Beginning | 5.9 | 7.8 |
Service cost | 1.1 | 0.8 | 0.8
Interest cost | 0.2 | 0.1 | 0.2
Plan settlements | (1.5) | (4.6) |
Plan amendments | 0.0 | 1.4 |
Plan curtailments | 0.0 | (0.1) |
Actuarial (gains) losses | 0.1 | 0.5 |
Benefits paid | 0.0 | 0.0 |
Benefit Obligation, Ending | 5.8 | 5.9 | 7.8
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 | 0.2 | 4.6 |
Plan settlements | (0.2) | (4.6) |
Benefits paid | 0.0 | 0.0 |
Fair Value of Plan Assets, Ending | 0.0 | 0.0 | 0.0
Funded status at end of year | (5.8) | (5.9) |
Accumulated Benefit Obligation | (4.8) | (5.4) |
Restoration of Retirement Income Plan [Member] | Og and E [Member] |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |
Benefit Obligation, Beginning | 0.5 | 3.0 |
Service cost | 0.0 | 0.0 | 0.1
Interest cost | 0.0 | 0.0 | 0.1
Plan settlements | 0.0 | (2.9) |
Plan amendments | 0.0 | 0.0 |
Plan curtailments | 0.0 | 0.0 |
Actuarial (gains) losses | 0.0 | 0.4 |
Benefits paid | 0.0 | 0.0 |
Benefit Obligation, Ending | 0.5 | 0.5 | 3.0
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 | 0.0 | 2.9 |
Plan settlements | 0.0 | (2.9) |
Benefits paid | 0.0 | 0.0 |
Fair Value of Plan Assets, Ending | 0.0 | 0.0 | 0.0
Funded status at end of year | (0.5) | (0.5) |
Accumulated Benefit Obligation | (0.4) | (0.4) |
Other Postretirement Benefits Plan [Member] |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |
Benefit Obligation, Beginning | 137.3 | 144.5 |
Service cost | 0.2 | 0.2 | 0.2
Interest cost | 3.5 | 3.4 | 4.2
Plan curtailments | 0.0 | 1.9 |
Participants' contributions | 3.5 | 3.5 |
Actuarial (gains) losses | (29.1) | (3.7) |
Benefits paid | (13.5) | (12.5) |
Benefit Obligation, Ending | 101.9 | 137.3 | 144.5
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |
Fair Value of Plan Assets, Beginning | 44.3 | 47.6 |
Actual return on plans' assets | (8.2) | (0.5) |
Employer contributions | 6.7 | 6.2 |
Participants' contributions | 3.5 | 3.5 |
Benefits paid | (13.5) | (12.5) |
Fair Value of Plan Assets, Ending | 32.8 | 44.3 | 47.6
Accumulated Benefit Obligation | (69.1) | (93.0) |
Other Postretirement Benefits Plan [Member] | Og and E [Member] |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |
Benefit Obligation, Beginning | 102.4 | 109.5 |
Service cost | 0.1 | 0.1 | 0.2
Interest cost | 2.7 | 2.6 | 3.2
Plan curtailments | 0.0 | 0.0 |
Participants' contributions | 2.4 | 2.6 |
Actuarial (gains) losses | (21.0) | (2.5) |
Benefits paid | (10.2) | (9.9) |
Benefit Obligation, Ending | 76.4 | 102.4 | 109.5
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |
Fair Value of Plan Assets, Beginning | 39.9 | 42.7 |
Actual return on plans' assets | (7.4) | (0.5) |
Employer contributions | 5.1 | 5.0 |
Participants' contributions | 2.4 | 2.6 |
Benefits paid | (10.2) | (9.9) |
Fair Value of Plan Assets, Ending | 29.8 | 39.9 | $ 42.7
Accumulated Benefit Obligation | $ (46.6) | $ (62.5) |

X
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- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI https://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 + Details
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- Definition Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(4) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(6) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI https://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 + Details
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- Definition Amount of contributions received by defined benefit plan from participant which increase benefit obligation. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Amount of contribution received by defined benefit plan from employer which increases plan assets. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI https://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e2709-114920 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI https://asc.fasb.org/extlink&oid=123450688&loc=d3e4587-114921 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Amount of payment to participant under defined benefit plan which decreases plan assets. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(5) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI https://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 + Details
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- Definition Amount of payment, which decreases plan assets of defined benefit plan, for irrevocable action relieving primary responsibility for benefit obligation and eliminating risk for obligation and assets used to effect settlement. Transaction constituting settlement includes, but is not limited to, making lump-sum cash payment to participant in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contract. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(8) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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