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Benefit Plans 2 (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | $ 4,124.7 | $ 5,352.9 | $ 5,556.6
Year End Allocation |  |  |  |
Total |  | 100.00% | 100.00% |
Pension Plan [Member] | AEP Texas Inc. [Member] |  |  |  |
Allocated Assets of Investments |  | 8.10% | 8.30% |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | $ 335.1 | $ 444.9 | 474.0
Pension Plan [Member] | Appalachian Power Co [Member] |  |  |  |
Allocated Assets of Investments |  | 12.90% | 12.80% |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | $ 531.7 | $ 683.3 | 701.3
Pension Plan [Member] | Indiana Michigan Power Co [Member] |  |  |  |
Allocated Assets of Investments |  | 12.90% | 12.70% |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | $ 533.7 | $ 681.5 | 698.1
Pension Plan [Member] | Ohio Power Co [Member] |  |  |  |
Allocated Assets of Investments |  | 9.90% | 9.80% |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | $ 406.4 | $ 524.8 | 543.1
Pension Plan [Member] | Public Service Co Of Oklahoma [Member] |  |  |  |
Allocated Assets of Investments |  | 5.30% | 5.30% |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | $ 218.5 | $ 286.2 | 299.8
Pension Plan [Member] | Southwestern Electric Power Co [Member] |  |  |  |
Allocated Assets of Investments |  | 5.60% | 5.80% |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | $ 231.3 | $ 308.3 | 326.9
Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | $ 1,549.3 | $ 2,044.3 | 1,946.7
Year End Allocation |  |  |  |
Total |  | 100.00% | 100.00% |
Other Postretirement Benefit Plans [Member] | AEP Texas Inc. [Member] |  |  |  |
Allocated Assets of Investments |  | 8.30% | 8.30% |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | $ 128.3 | $ 168.8 | 162.3
Other Postretirement Benefit Plans [Member] | Appalachian Power Co [Member] |  |  |  |
Allocated Assets of Investments |  | 14.80% | 14.80% |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | $ 228.6 | $ 302.3 | 293.0
Other Postretirement Benefit Plans [Member] | Indiana Michigan Power Co [Member] |  |  |  |
Allocated Assets of Investments |  | 12.30% | 12.20% |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | $ 190.5 | $ 248.7 | 238.2
Other Postretirement Benefit Plans [Member] | Ohio Power Co [Member] |  |  |  |
Allocated Assets of Investments |  | 10.70% | 10.80% |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | $ 166.2 | $ 220.0 | 213.0
Other Postretirement Benefit Plans [Member] | Public Service Co Of Oklahoma [Member] |  |  |  |
Allocated Assets of Investments |  | 5.50% | 5.60% |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | $ 85.4 | $ 114.0 | 107.8
Other Postretirement Benefit Plans [Member] | Southwestern Electric Power Co [Member] |  |  |  |
Allocated Assets of Investments |  | 6.60% | 6.70% |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | $ 103.0 | $ 136.6 | $ 129.9
Other [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 1,173.3 | 1,262.6 |
Other [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 300.9 | 445.4 |
Level 1 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 745.4 | 854.7 |
Level 1 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 765.3 | 895.2 |
Level 2 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 2,206.0 | 3,235.6 |
Level 2 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 483.1 | 703.7 |
Level 3 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 0.0 | 0.0 |
Level 3 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 0.0 | 0.0 |
Equity Securities [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1] | $ 1,125.9 | $ 1,318.5 |
Year End Allocation |  |  |  |
Total | [1] | 27.30% | 24.60% |
Equity Securities [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | $ 848.2 | $ 1,035.3 |
Year End Allocation |  |  |  |
Total |  | 54.70% | 50.70% |
Equity Securities [Member] | Other [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1] | $ 379.9 | $ 463.9 |
Equity Securities [Member] | Other [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 169.1 | 265.0 |
Equity Securities [Member] | Level 1 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1] | 746.0 | 854.6 |
Equity Securities [Member] | Level 1 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 679.1 | 770.3 |
Equity Securities [Member] | Level 2 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1] | 0.0 | 0.0 |
Equity Securities [Member] | Level 2 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 0.0 | 0.0 |
Equity Securities [Member] | Level 3 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1] | 0.0 | 0.0 |
Equity Securities [Member] | Level 3 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 0.0 | 0.0 |
Domestic [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1] | $ 347.6 | $ 388.9 |
Year End Allocation |  |  |  |
Total | [1] | 8.40% | 7.20% |
Domestic [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | $ 414.1 | $ 474.0 |
Year End Allocation |  |  |  |
Total |  | 26.70% | 23.20% |
Domestic [Member] | Other [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1] | $ 0.0 | $ 0.0 |
Domestic [Member] | Other [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 0.0 | 0.0 |
Domestic [Member] | Level 1 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1] | 347.6 | 388.9 |
Domestic [Member] | Level 1 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 414.1 | 474.0 |
Domestic [Member] | Level 2 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1] | 0.0 | 0.0 |
Domestic [Member] | Level 2 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 0.0 | 0.0 |
Domestic [Member] | Level 3 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1] | 0.0 | 0.0 |
Domestic [Member] | Level 3 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 0.0 | 0.0 |
International [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1] | $ 398.4 | $ 465.7 |
Year End Allocation |  |  |  |
Total | [1] | 9.70% | 8.70% |
International [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | $ 265.0 | $ 296.3 |
Year End Allocation |  |  |  |
Total |  | 17.10% | 14.50% |
International [Member] | Other [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1] | $ 0.0 | $ 0.0 |
International [Member] | Other [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 0.0 | 0.0 |
International [Member] | Level 1 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1] | 398.4 | 465.7 |
International [Member] | Level 1 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 265.0 | 296.3 |
International [Member] | Level 2 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1] | 0.0 | 0.0 |
International [Member] | Level 2 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 0.0 | 0.0 |
International [Member] | Level 3 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1] | 0.0 | 0.0 |
International [Member] | Level 3 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 0.0 | 0.0 |
Common Collective Trusts [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1],[2] | $ 379.9 | $ 463.9 |
Year End Allocation |  |  |  |
Total | [1],[2] | 9.20% | 8.70% |
Common Collective Trusts [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [3] | $ 169.1 | $ 265.0 |
Year End Allocation |  |  |  |
Total | [3] | 10.90% | 13.00% |
Common Collective Trusts [Member] | Other [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1],[2] | $ 379.9 | $ 463.9 |
Common Collective Trusts [Member] | Other [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [3] | 169.1 | 265.0 |
Common Collective Trusts [Member] | Level 1 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1],[2] | 0.0 | 0.0 |
Common Collective Trusts [Member] | Level 1 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [3] | 0.0 | 0.0 |
Common Collective Trusts [Member] | Level 2 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1],[2] | 0.0 | 0.0 |
Common Collective Trusts [Member] | Level 2 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [3] | 0.0 | 0.0 |
Common Collective Trusts [Member] | Level 3 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1],[2] | 0.0 | 0.0 |
Common Collective Trusts [Member] | Level 3 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [3] | 0.0 | 0.0 |
Fixed Income [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1] | $ 2,140.5 | $ 3,171.4 |
Year End Allocation |  |  |  |
Total | [1] | 51.90% | 59.20% |
Fixed Income [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | $ 509.4 | $ 768.6 |
Year End Allocation |  |  |  |
Total |  | 33.00% | 37.60% |
Fixed Income [Member] | Other [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1] | $ 0.0 | $ 0.0 |
Fixed Income [Member] | Other [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 120.3 | 167.7 |
Fixed Income [Member] | Level 1 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1] | (0.6) | 0.1 |
Fixed Income [Member] | Level 1 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 63.0 | 91.9 |
Fixed Income [Member] | Level 2 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1] | 2,141.1 | 3,171.3 |
Fixed Income [Member] | Level 2 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 326.1 | 509.0 |
Fixed Income [Member] | Level 3 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1] | 0.0 | 0.0 |
Fixed Income [Member] | Level 3 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 0.0 | 0.0 |
Common Collective Trust - Debt [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [3] | $ 120.3 | $ 167.7 |
Year End Allocation |  |  |  |
Total | [3] | 7.80% | 8.20% |
Common Collective Trust - Debt [Member] | Other [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [3] | $ 120.3 | $ 167.7 |
Common Collective Trust - Debt [Member] | Level 1 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [3] | 0.0 | 0.0 |
Common Collective Trust - Debt [Member] | Level 2 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [3] | 0.0 | 0.0 |
Common Collective Trust - Debt [Member] | Level 3 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [3] | 0.0 | 0.0 |
United States Government and Agency Securities [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1] | $ 1,070.8 | $ 1,557.7 |
Year End Allocation |  |  |  |
Total | [1] | 26.00% | 29.10% |
United States Government and Agency Securities [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | $ 155.9 | $ 222.4 |
Year End Allocation |  |  |  |
Total |  | 10.10% | 10.90% |
United States Government and Agency Securities [Member] | Other [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1] | $ 0.0 | $ 0.0 |
United States Government and Agency Securities [Member] | Other [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 0.0 | 0.0 |
United States Government and Agency Securities [Member] | Level 1 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1] | (0.6) | 0.1 |
United States Government and Agency Securities [Member] | Level 1 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 0.1 | 0.0 |
United States Government and Agency Securities [Member] | Level 2 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1] | 1,071.4 | 1,557.6 |
United States Government and Agency Securities [Member] | Level 2 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 155.8 | 222.4 |
United States Government and Agency Securities [Member] | Level 3 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1] | 0.0 | 0.0 |
United States Government and Agency Securities [Member] | Level 3 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 0.0 | 0.0 |
Corporate Debt [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1] | $ 891.7 | $ 1,295.9 |
Year End Allocation |  |  |  |
Total | [1] | 21.60% | 24.20% |
Corporate Debt [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | $ 141.5 | $ 233.2 |
Year End Allocation |  |  |  |
Total |  | 9.10% | 11.40% |
Corporate Debt [Member] | Other [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1] | $ 0.0 | $ 0.0 |
Corporate Debt [Member] | Other [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 0.0 | 0.0 |
Corporate Debt [Member] | Level 1 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1] | 0.0 | 0.0 |
Corporate Debt [Member] | Level 1 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 0.0 | 0.0 |
Corporate Debt [Member] | Level 2 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1] | 891.7 | 1,295.9 |
Corporate Debt [Member] | Level 2 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 141.5 | 233.2 |
Corporate Debt [Member] | Level 3 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1] | 0.0 | 0.0 |
Corporate Debt [Member] | Level 3 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 0.0 | 0.0 |
Foreign Debt [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1] | $ 140.2 | $ 259.4 |
Year End Allocation |  |  |  |
Total | [1] | 3.40% | 4.80% |
Foreign Debt [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | $ 21.0 | $ 39.8 |
Year End Allocation |  |  |  |
Total |  | 1.40% | 2.00% |
Foreign Debt [Member] | Other [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1] | $ 0.0 | $ 0.0 |
Foreign Debt [Member] | Other [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 0.0 | 0.0 |
Foreign Debt [Member] | Level 1 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1] | 0.0 | 0.0 |
Foreign Debt [Member] | Level 1 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 0.0 | 0.0 |
Foreign Debt [Member] | Level 2 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1] | 140.2 | 259.4 |
Foreign Debt [Member] | Level 2 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 21.0 | 39.8 |
Foreign Debt [Member] | Level 3 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1] | 0.0 | 0.0 |
Foreign Debt [Member] | Level 3 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 0.0 | 0.0 |
State and Local Government [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1] | $ 37.0 | $ 57.1 |
Year End Allocation |  |  |  |
Total | [1] | 0.90% | 1.10% |
State and Local Government [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | $ 70.7 | $ 105.5 |
Year End Allocation |  |  |  |
Total |  | 4.60% | 5.10% |
State and Local Government [Member] | Other [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1] | $ 0.0 | $ 0.0 |
State and Local Government [Member] | Other [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 0.0 | 0.0 |
State and Local Government [Member] | Level 1 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1] | 0.0 | 0.0 |
State and Local Government [Member] | Level 1 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 62.9 | 91.9 |
State and Local Government [Member] | Level 2 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1] | 37.0 | 57.1 |
State and Local Government [Member] | Level 2 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 7.8 | 13.6 |
State and Local Government [Member] | Level 3 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1] | 0.0 | 0.0 |
State and Local Government [Member] | Level 3 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 0.0 | 0.0 |
Other - Asset Backed [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1] | $ 0.8 | $ 1.3 |
Year End Allocation |  |  |  |
Total | [1] | 0.00% | 0.00% |
Other - Asset Backed [Member] | Other [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1] | $ 0.0 | $ 0.0 |
Other - Asset Backed [Member] | Level 1 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1] | 0.0 | 0.0 |
Other - Asset Backed [Member] | Level 2 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1] | 0.8 | 1.3 |
Other - Asset Backed [Member] | Level 3 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [1] | 0.0 | 0.0 |
Infrastructure [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [2] | $ 109.2 | $ 92.1 |
Year End Allocation |  |  |  |
Total | [2] | 2.60% | 1.70% |
Infrastructure [Member] | Other [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [2] | $ 109.2 | $ 92.1 |
Infrastructure [Member] | Level 1 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [2] | 0.0 | 0.0 |
Infrastructure [Member] | Level 2 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [2] | 0.0 | 0.0 |
Infrastructure [Member] | Level 3 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [2] | 0.0 | 0.0 |
Real Estate [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [2] | $ 276.9 | $ 232.6 |
Year End Allocation |  |  |  |
Total | [2] | 6.70% | 4.40% |
Real Estate [Member] | Other [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [2] | $ 276.9 | $ 232.6 |
Real Estate [Member] | Level 1 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [2] | 0.0 | 0.0 |
Real Estate [Member] | Level 2 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [2] | 0.0 | 0.0 |
Real Estate [Member] | Level 3 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [2] | 0.0 | 0.0 |
Alternative Investments [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [2] | $ 319.7 | $ 448.8 |
Year End Allocation |  |  |  |
Total | [2] | 7.80% | 8.40% |
Alternative Investments [Member] | Other [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [2] | $ 319.7 | $ 448.8 |
Alternative Investments [Member] | Level 1 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [2] | 0.0 | 0.0 |
Alternative Investments [Member] | Level 2 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [2] | 0.0 | 0.0 |
Alternative Investments [Member] | Level 3 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [2] | 0.0 | 0.0 |
Trusted Owned Life Insurance [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | $ 157.0 | $ 194.7 |
Year End Allocation |  |  |  |
Total |  | 10.10% | 9.50% |
Trusted Owned Life Insurance [Member] | Other [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | $ 0.0 | $ 0.0 |
Trusted Owned Life Insurance [Member] | Level 1 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 0.0 | 0.0 |
Trusted Owned Life Insurance [Member] | Level 2 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 157.0 | 194.7 |
Trusted Owned Life Insurance [Member] | Level 3 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 0.0 | 0.0 |
International Equities [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
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Year End Allocation |  |  |  |
Total |  | 3.00% | 1.10% |
International Equities [Member] | Other [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | $ 0.0 | $ 0.0 |
International Equities [Member] | Level 1 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 0.0 | 0.0 |
International Equities [Member] | Level 2 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 46.7 | 23.4 |
International Equities [Member] | Level 3 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 0.0 | 0.0 |
United States Bonds [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | $ 110.3 | $ 171.3 |
Year End Allocation |  |  |  |
Total |  | 7.10% | 8.40% |
United States Bonds [Member] | Other [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | $ 0.0 | $ 0.0 |
United States Bonds [Member] | Level 1 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 0.0 | 0.0 |
United States Bonds [Member] | Level 2 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 110.3 | 171.3 |
United States Bonds [Member] | Level 3 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class |  | 0.0 | 0.0 |
Cash and Cash Equivalents [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [2] | $ 123.2 | $ 117.7 |
Year End Allocation |  |  |  |
Total | [2] | 3.00% | 2.20% |
Cash and Cash Equivalents [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [3] | $ 29.9 | $ 39.7 |
Year End Allocation |  |  |  |
Total | [3] | 1.90% | 1.90% |
Cash and Cash Equivalents [Member] | Other [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [2] | $ 58.3 | $ 53.4 |
Cash and Cash Equivalents [Member] | Other [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [3] | 6.7 | 6.7 |
Cash and Cash Equivalents [Member] | Level 1 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [2] | 0.0 | 0.0 |
Cash and Cash Equivalents [Member] | Level 1 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [3] | 23.2 | 33.0 |
Cash and Cash Equivalents [Member] | Level 2 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [2] | 64.9 | 64.3 |
Cash and Cash Equivalents [Member] | Level 2 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [3] | 0.0 | 0.0 |
Cash and Cash Equivalents [Member] | Level 3 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [2] | 0.0 | 0.0 |
Cash and Cash Equivalents [Member] | Level 3 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [3] | 0.0 | 0.0 |
Other - Pending Transactions and Accrued Income [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [4] | $ 29.3 | $ (28.2) |
Year End Allocation |  |  |  |
Total | [4] | 0.70% | (0.50%) |
Other - Pending Transactions and Accrued Income [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [5] | $ 4.8 | $ 6.0 |
Year End Allocation |  |  |  |
Total | [5] | 0.30% | 0.30% |
Other - Pending Transactions and Accrued Income [Member] | Other [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [4] | $ 29.3 | $ (28.2) |
Other - Pending Transactions and Accrued Income [Member] | Other [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [5] | 4.8 | 6.0 |
Other - Pending Transactions and Accrued Income [Member] | Level 1 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [4] | 0.0 | 0.0 |
Other - Pending Transactions and Accrued Income [Member] | Level 1 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [5] | 0.0 | 0.0 |
Other - Pending Transactions and Accrued Income [Member] | Level 2 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [4] | 0.0 | 0.0 |
Other - Pending Transactions and Accrued Income [Member] | Level 2 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [5] | 0.0 | 0.0 |
Other - Pending Transactions and Accrued Income [Member] | Level 3 [Member] | Pension Plan [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [4] | 0.0 | 0.0 |
Other - Pending Transactions and Accrued Income [Member] | Level 3 [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Pension and Other Postretirement Plans' Assets |  |  |  |
Asset Class | [5] | $ 0.0 | $ 0.0 |
[1] | Includes investment securities loaned to borrowers under the securities lending program. See the “Investments Held in Trust for Future Liabilities” section of Note 1 for additional information.
[2] | Amounts in “Other” column represent investments for which fair value is measured using net asset value per-share.
[3] | Amounts in “Other” column represent investments for which fair value is measured using net asset value per-share.
[4] | Amounts in “Other” column primarily represent accrued interest, dividend receivables and transactions pending settlement.
[5] | Amounts in “Other” column primarily represent accrued interest, dividend receivables and transactions pending settlement.

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