Benefit Plans 2 (Details) - USD ($)
$ in Millions |
Dec. 31, 2023 |
Dec. 31, 2022 |
Dec. 31, 2021 |
| Pension Plan [Member] |
|
|
|
|
| Pension and Other Postretirement Plans' Assets |
|
|
|
|
| Asset Class |
|
$ 4,118.2
|
$ 4,124.7
|
$ 5,352.9
|
| Year End Allocation |
|
|
|
|
| Total |
|
100.00%
|
100.00%
|
|
| Pension Plan [Member] | AEP Texas Inc. [Member] |
|
|
|
|
| Allocated Assets of Investments |
|
8.10%
|
8.10%
|
|
| Pension and Other Postretirement Plans' Assets |
|
|
|
|
| Asset Class |
|
$ 332.7
|
$ 335.1
|
444.9
|
| Pension Plan [Member] | Appalachian Power Co [Member] |
|
|
|
|
| Allocated Assets of Investments |
|
13.40%
|
12.90%
|
|
| Pension and Other Postretirement Plans' Assets |
|
|
|
|
| Asset Class |
|
$ 549.8
|
$ 531.7
|
683.3
|
| Pension Plan [Member] | Indiana Michigan Power Co [Member] |
|
|
|
|
| Allocated Assets of Investments |
|
13.40%
|
12.90%
|
|
| Pension and Other Postretirement Plans' Assets |
|
|
|
|
| Asset Class |
|
$ 550.6
|
$ 533.7
|
681.5
|
| Pension Plan [Member] | Ohio Power Co [Member] |
|
|
|
|
| Allocated Assets of Investments |
|
10.20%
|
9.90%
|
|
| Pension and Other Postretirement Plans' Assets |
|
|
|
|
| Asset Class |
|
$ 419.5
|
$ 406.4
|
524.8
|
| Pension Plan [Member] | Public Service Co Of Oklahoma [Member] |
|
|
|
|
| Allocated Assets of Investments |
|
5.40%
|
5.30%
|
|
| Pension and Other Postretirement Plans' Assets |
|
|
|
|
| Asset Class |
|
$ 222.7
|
$ 218.5
|
286.2
|
| Pension Plan [Member] | Southwestern Electric Power Co [Member] |
|
|
|
|
| Allocated Assets of Investments |
|
5.50%
|
5.60%
|
|
| Pension and Other Postretirement Plans' Assets |
|
|
|
|
| Asset Class |
|
$ 227.5
|
$ 231.3
|
308.3
|
| Other Postretirement Benefit Plans [Member] |
|
|
|
|
| Pension and Other Postretirement Plans' Assets |
|
|
|
|
| Asset Class |
|
$ 1,673.3
|
$ 1,549.3
|
2,044.3
|
| Year End Allocation |
|
|
|
|
| Total |
|
100.00%
|
100.00%
|
|
| Other Postretirement Benefit Plans [Member] | AEP Texas Inc. [Member] |
|
|
|
|
| Allocated Assets of Investments |
|
8.20%
|
8.30%
|
|
| Pension and Other Postretirement Plans' Assets |
|
|
|
|
| Asset Class |
|
$ 137.5
|
$ 128.3
|
168.8
|
| Other Postretirement Benefit Plans [Member] | Appalachian Power Co [Member] |
|
|
|
|
| Allocated Assets of Investments |
|
14.50%
|
14.80%
|
|
| Pension and Other Postretirement Plans' Assets |
|
|
|
|
| Asset Class |
|
$ 243.0
|
$ 228.6
|
302.3
|
| Other Postretirement Benefit Plans [Member] | Indiana Michigan Power Co [Member] |
|
|
|
|
| Allocated Assets of Investments |
|
12.20%
|
12.30%
|
|
| Pension and Other Postretirement Plans' Assets |
|
|
|
|
| Asset Class |
|
$ 204.6
|
$ 190.5
|
248.7
|
| Other Postretirement Benefit Plans [Member] | Ohio Power Co [Member] |
|
|
|
|
| Allocated Assets of Investments |
|
10.60%
|
10.70%
|
|
| Pension and Other Postretirement Plans' Assets |
|
|
|
|
| Asset Class |
|
$ 177.8
|
$ 166.2
|
220.0
|
| Other Postretirement Benefit Plans [Member] | Public Service Co Of Oklahoma [Member] |
|
|
|
|
| Allocated Assets of Investments |
|
5.40%
|
5.50%
|
|
| Pension and Other Postretirement Plans' Assets |
|
|
|
|
| Asset Class |
|
$ 90.2
|
$ 85.4
|
114.0
|
| Other Postretirement Benefit Plans [Member] | Southwestern Electric Power Co [Member] |
|
|
|
|
| Allocated Assets of Investments |
|
6.60%
|
6.60%
|
|
| Pension and Other Postretirement Plans' Assets |
|
|
|
|
| Asset Class |
|
$ 111.1
|
$ 103.0
|
$ 136.6
|
| Other [Member] | Pension Plan [Member] |
|
|
|
|
| Pension and Other Postretirement Plans' Assets |
|
|
|
|
| Asset Class |
|
1,056.6
|
1,173.3
|
|
| Other [Member] | Other Postretirement Benefit Plans [Member] |
|
|
|
|
| Pension and Other Postretirement Plans' Assets |
|
|
|
|
| Asset Class |
|
274.3
|
300.9
|
|
| Level 1 [Member] | Pension Plan [Member] |
|
|
|
|
| Pension and Other Postretirement Plans' Assets |
|
|
|
|
| Asset Class |
|
809.4
|
745.4
|
|
| Level 1 [Member] | Other Postretirement Benefit Plans [Member] |
|
|
|
|
| Pension and Other Postretirement Plans' Assets |
|
|
|
|
| Asset Class |
|
897.8
|
765.3
|
|
| Level 2 [Member] | Pension Plan [Member] |
|
|
|
|
| Pension and Other Postretirement Plans' Assets |
|
|
|
|
| Asset Class |
|
2,252.1
|
2,206.0
|
|
| Level 2 [Member] | Other Postretirement Benefit Plans [Member] |
|
|
|
|
| Pension and Other Postretirement Plans' Assets |
|
|
|
|
| Asset Class |
|
501.2
|
483.1
|
|
| Level 3 [Member] | Pension Plan [Member] |
|
|
|
|
| Pension and Other Postretirement Plans' Assets |
|
|
|
|
| Asset Class |
|
0.1
|
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] |
$ 1,222.0
|
$ 1,125.9
|
|
| Year End Allocation |
|
|
|
|
| Total |
[1] |
29.70%
|
27.30%
|
|
| Equity Securities [Member] | Other Postretirement Benefit Plans [Member] |
|
|
|
|
| Pension and Other Postretirement Plans' Assets |
|
|
|
|
| Asset Class |
|
$ 960.6
|
$ 848.2
|
|
| Year End Allocation |
|
|
|
|
| Total |
|
57.40%
|
54.70%
|
|
| Equity Securities [Member] | Other [Member] | Pension Plan [Member] |
|
|
|
|
| Pension and Other Postretirement Plans' Assets |
|
|
|
|
| Asset Class |
[1] |
$ 420.9
|
$ 379.9
|
|
| Equity Securities [Member] | Other [Member] | Other Postretirement Benefit Plans [Member] |
|
|
|
|
| Pension and Other Postretirement Plans' Assets |
|
|
|
|
| Asset Class |
|
131.6
|
169.1
|
|
| Equity Securities [Member] | Level 1 [Member] | Pension Plan [Member] |
|
|
|
|
| Pension and Other Postretirement Plans' Assets |
|
|
|
|
| Asset Class |
[1] |
801.1
|
746.0
|
|
| Equity Securities [Member] | Level 1 [Member] | Other Postretirement Benefit Plans [Member] |
|
|
|
|
| Pension and Other Postretirement Plans' Assets |
|
|
|
|
| Asset Class |
|
829.0
|
679.1
|
|
| 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] |
$ 411.3
|
$ 347.6
|
|
| Year End Allocation |
|
|
|
|
| Total |
[1] |
10.00%
|
8.40%
|
|
| Domestic [Member] | Other Postretirement Benefit Plans [Member] |
|
|
|
|
| Pension and Other Postretirement Plans' Assets |
|
|
|
|
| Asset Class |
|
$ 540.6
|
$ 414.1
|
|
| Year End Allocation |
|
|
|
|
| Total |
|
32.30%
|
26.70%
|
|
| 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] |
411.3
|
347.6
|
|
| Domestic [Member] | Level 1 [Member] | Other Postretirement Benefit Plans [Member] |
|
|
|
|
| Pension and Other Postretirement Plans' Assets |
|
|
|
|
| Asset Class |
|
540.6
|
414.1
|
|
| 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] |
$ 389.8
|
$ 398.4
|
|
| Year End Allocation |
|
|
|
|
| Total |
[1] |
9.50%
|
9.70%
|
|
| International [Member] | Other Postretirement Benefit Plans [Member] |
|
|
|
|
| Pension and Other Postretirement Plans' Assets |
|
|
|
|
| Asset Class |
|
$ 288.4
|
$ 265.0
|
|
| Year End Allocation |
|
|
|
|
| Total |
|
17.20%
|
17.10%
|
|
| 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] |
389.8
|
398.4
|
|
| International [Member] | Level 1 [Member] | Other Postretirement Benefit Plans [Member] |
|
|
|
|
| Pension and Other Postretirement Plans' Assets |
|
|
|
|
| Asset Class |
|
288.4
|
265.0
|
|
| 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] |
$ 420.9
|
$ 379.9
|
|
| Year End Allocation |
|
|
|
|
| Total |
[1],[2] |
10.20%
|
9.20%
|
|
| Common Collective Trusts [Member] | Other Postretirement Benefit Plans [Member] |
|
|
|
|
| Pension and Other Postretirement Plans' Assets |
|
|
|
|
| Asset Class |
[3] |
$ 131.6
|
$ 169.1
|
|
| Year End Allocation |
|
|
|
|
| Total |
[3] |
7.90%
|
10.90%
|
|
| Common Collective Trusts [Member] | Other [Member] | Pension Plan [Member] |
|
|
|
|
| Pension and Other Postretirement Plans' Assets |
|
|
|
|
| Asset Class |
[1],[2] |
$ 420.9
|
$ 379.9
|
|
| Common Collective Trusts [Member] | Other [Member] | Other Postretirement Benefit Plans [Member] |
|
|
|
|
| Pension and Other Postretirement Plans' Assets |
|
|
|
|
| Asset Class |
[3] |
131.6
|
169.1
|
|
| 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] |
$ 2,209.4
|
$ 2,140.5
|
|
| Year End Allocation |
|
|
|
|
| Total |
[1] |
53.60%
|
51.90%
|
|
| Fixed Income [Member] | Other Postretirement Benefit Plans [Member] |
|
|
|
|
| Pension and Other Postretirement Plans' Assets |
|
|
|
|
| Asset Class |
|
$ 538.5
|
$ 509.4
|
|
| Year End Allocation |
|
|
|
|
| Total |
|
32.20%
|
33.00%
|
|
| 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 |
|
146.7
|
120.3
|
|
| Fixed Income [Member] | Level 1 [Member] | Pension Plan [Member] |
|
|
|
|
| Pension and Other Postretirement Plans' Assets |
|
|
|
|
| Asset Class |
[1] |
8.3
|
(0.6)
|
|
| Fixed Income [Member] | Level 1 [Member] | Other Postretirement Benefit Plans [Member] |
|
|
|
|
| Pension and Other Postretirement Plans' Assets |
|
|
|
|
| Asset Class |
|
42.9
|
63.0
|
|
| Fixed Income [Member] | Level 2 [Member] | Pension Plan [Member] |
|
|
|
|
| Pension and Other Postretirement Plans' Assets |
|
|
|
|
| Asset Class |
[1] |
2,201.1
|
2,141.1
|
|
| Fixed Income [Member] | Level 2 [Member] | Other Postretirement Benefit Plans [Member] |
|
|
|
|
| Pension and Other Postretirement Plans' Assets |
|
|
|
|
| Asset Class |
|
348.9
|
326.1
|
|
| 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] |
$ 146.7
|
$ 120.3
|
|
| Year End Allocation |
|
|
|
|
| Total |
[3] |
8.80%
|
7.80%
|
|
| Common Collective Trust - Debt [Member] | Other [Member] | Other Postretirement Benefit Plans [Member] |
|
|
|
|
| Pension and Other Postretirement Plans' Assets |
|
|
|
|
| Asset Class |
[3] |
$ 146.7
|
$ 120.3
|
|
| 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] |
$ 1,107.5
|
$ 1,070.8
|
|
| Year End Allocation |
|
|
|
|
| Total |
[1] |
26.90%
|
26.00%
|
|
| United States Government and Agency Securities [Member] | Other Postretirement Benefit Plans [Member] |
|
|
|
|
| Pension and Other Postretirement Plans' Assets |
|
|
|
|
| Asset Class |
|
$ 164.7
|
$ 155.9
|
|
| Year End Allocation |
|
|
|
|
| Total |
|
9.80%
|
10.10%
|
|
| 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] |
8.3
|
(0.6)
|
|
| United States Government and Agency Securities [Member] | Level 1 [Member] | Other Postretirement Benefit Plans [Member] |
|
|
|
|
| Pension and Other Postretirement Plans' Assets |
|
|
|
|
| Asset Class |
|
1.4
|
0.1
|
|
| United States Government and Agency Securities [Member] | Level 2 [Member] | Pension Plan [Member] |
|
|
|
|
| Pension and Other Postretirement Plans' Assets |
|
|
|
|
| Asset Class |
[1] |
1,099.2
|
1,071.4
|
|
| United States Government and Agency Securities [Member] | Level 2 [Member] | Other Postretirement Benefit Plans [Member] |
|
|
|
|
| Pension and Other Postretirement Plans' Assets |
|
|
|
|
| Asset Class |
|
163.3
|
155.8
|
|
| 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] |
$ 894.8
|
$ 891.7
|
|
| Year End Allocation |
|
|
|
|
| Total |
[1] |
21.70%
|
21.60%
|
|
| Corporate Debt [Member] | Other Postretirement Benefit Plans [Member] |
|
|
|
|
| Pension and Other Postretirement Plans' Assets |
|
|
|
|
| Asset Class |
|
$ 149.0
|
$ 141.5
|
|
| Year End Allocation |
|
|
|
|
| Total |
|
8.90%
|
9.10%
|
|
| 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] |
894.8
|
891.7
|
|
| Corporate Debt [Member] | Level 2 [Member] | Other Postretirement Benefit Plans [Member] |
|
|
|
|
| Pension and Other Postretirement Plans' Assets |
|
|
|
|
| Asset Class |
|
149.0
|
141.5
|
|
| 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] |
$ 167.1
|
$ 140.2
|
|
| Year End Allocation |
|
|
|
|
| Total |
[1] |
4.10%
|
3.40%
|
|
| Foreign Debt [Member] | Other Postretirement Benefit Plans [Member] |
|
|
|
|
| Pension and Other Postretirement Plans' Assets |
|
|
|
|
| Asset Class |
|
$ 28.6
|
$ 21.0
|
|
| Year End Allocation |
|
|
|
|
| Total |
|
1.70%
|
1.40%
|
|
| 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] |
167.1
|
140.2
|
|
| Foreign Debt [Member] | Level 2 [Member] | Other Postretirement Benefit Plans [Member] |
|
|
|
|
| Pension and Other Postretirement Plans' Assets |
|
|
|
|
| Asset Class |
|
28.6
|
21.0
|
|
| 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] |
$ 38.7
|
$ 37.0
|
|
| Year End Allocation |
|
|
|
|
| Total |
[1] |
0.90%
|
0.90%
|
|
| State and Local Government [Member] | Other Postretirement Benefit Plans [Member] |
|
|
|
|
| Pension and Other Postretirement Plans' Assets |
|
|
|
|
| Asset Class |
|
$ 49.3
|
$ 70.7
|
|
| Year End Allocation |
|
|
|
|
| Total |
|
3.00%
|
4.60%
|
|
| 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 |
|
41.5
|
62.9
|
|
| State and Local Government [Member] | Level 2 [Member] | Pension Plan [Member] |
|
|
|
|
| Pension and Other Postretirement Plans' Assets |
|
|
|
|
| Asset Class |
[1] |
38.7
|
37.0
|
|
| State and Local Government [Member] | Level 2 [Member] | Other Postretirement Benefit Plans [Member] |
|
|
|
|
| Pension and Other Postretirement Plans' Assets |
|
|
|
|
| Asset Class |
|
7.8
|
7.8
|
|
| 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] |
$ 1.3
|
$ 0.8
|
|
| Year End Allocation |
|
|
|
|
| Total |
[1] |
0.00%
|
0.00%
|
|
| Other - Asset Backed [Member] | Other Postretirement Benefit Plans [Member] |
|
|
|
|
| Pension and Other Postretirement Plans' Assets |
|
|
|
|
| Asset Class |
|
$ 0.2
|
|
|
| Year End Allocation |
|
|
|
|
| Total |
|
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] | Other [Member] | Other Postretirement Benefit Plans [Member] |
|
|
|
|
| Pension and Other Postretirement Plans' Assets |
|
|
|
|
| Asset Class |
|
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 1 [Member] | Other Postretirement Benefit Plans [Member] |
|
|
|
|
| Pension and Other Postretirement Plans' Assets |
|
|
|
|
| Asset Class |
|
0.0
|
|
|
| Other - Asset Backed [Member] | Level 2 [Member] | Pension Plan [Member] |
|
|
|
|
| Pension and Other Postretirement Plans' Assets |
|
|
|
|
| Asset Class |
[1] |
1.3
|
0.8
|
|
| Other - Asset Backed [Member] | Level 2 [Member] | Other Postretirement Benefit Plans [Member] |
|
|
|
|
| Pension and Other Postretirement Plans' Assets |
|
|
|
|
| Asset Class |
|
0.2
|
|
|
| Other - Asset Backed [Member] | Level 3 [Member] | Pension Plan [Member] |
|
|
|
|
| Pension and Other Postretirement Plans' Assets |
|
|
|
|
| Asset Class |
[1] |
0.0
|
0.0
|
|
| Other - Asset Backed [Member] | Level 3 [Member] | Other Postretirement Benefit Plans [Member] |
|
|
|
|
| Pension and Other Postretirement Plans' Assets |
|
|
|
|
| Asset Class |
|
0.0
|
|
|
| Infrastructure [Member] | Pension Plan [Member] |
|
|
|
|
| Pension and Other Postretirement Plans' Assets |
|
|
|
|
| Asset Class |
[2] |
$ 101.4
|
$ 109.2
|
|
| Year End Allocation |
|
|
|
|
| Total |
[2] |
2.50%
|
2.60%
|
|
| Infrastructure [Member] | Other [Member] | Pension Plan [Member] |
|
|
|
|
| Pension and Other Postretirement Plans' Assets |
|
|
|
|
| Asset Class |
[2] |
$ 101.4
|
$ 109.2
|
|
| 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] |
$ 239.3
|
$ 276.9
|
|
| Year End Allocation |
|
|
|
|
| Total |
[2] |
5.80%
|
6.70%
|
|
| Real Estate [Member] | Other [Member] | Pension Plan [Member] |
|
|
|
|
| Pension and Other Postretirement Plans' Assets |
|
|
|
|
| Asset Class |
[2] |
$ 239.3
|
$ 276.9
|
|
| 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] |
$ 241.8
|
$ 319.7
|
|
| Year End Allocation |
|
|
|
|
| Total |
[2] |
5.80%
|
7.80%
|
|
| Alternative Investments [Member] | Other [Member] | Pension Plan [Member] |
|
|
|
|
| Pension and Other Postretirement Plans' Assets |
|
|
|
|
| Asset Class |
[2] |
$ 241.8
|
$ 319.7
|
|
| 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 |
|
$ 152.3
|
$ 157.0
|
|
| Year End Allocation |
|
|
|
|
| Total |
|
9.10%
|
10.10%
|
|
| 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 |
|
152.3
|
157.0
|
|
| 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 |
|
|
|
|
| Asset Class |
|
$ 22.3
|
$ 46.7
|
|
| Year End Allocation |
|
|
|
|
| Total |
|
1.30%
|
3.00%
|
|
| 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 |
|
22.3
|
46.7
|
|
| 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 |
|
$ 130.0
|
$ 110.3
|
|
| Year End Allocation |
|
|
|
|
| Total |
|
7.80%
|
7.10%
|
|
| 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 |
|
130.0
|
110.3
|
|
| 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] |
$ 84.8
|
$ 123.2
|
|
| Year End Allocation |
|
|
|
|
| Total |
[2] |
2.10%
|
3.00%
|
|
| Cash and Cash Equivalents [Member] | Other Postretirement Benefit Plans [Member] |
|
|
|
|
| Pension and Other Postretirement Plans' Assets |
|
|
|
|
| Asset Class |
[3] |
$ 28.8
|
$ 29.9
|
|
| Year End Allocation |
|
|
|
|
| Total |
[3] |
1.70%
|
1.90%
|
|
| Cash and Cash Equivalents [Member] | Other [Member] | Pension Plan [Member] |
|
|
|
|
| Pension and Other Postretirement Plans' Assets |
|
|
|
|
| Asset Class |
[2] |
$ 33.8
|
$ 58.3
|
|
| Cash and Cash Equivalents [Member] | Other [Member] | Other Postretirement Benefit Plans [Member] |
|
|
|
|
| Pension and Other Postretirement Plans' Assets |
|
|
|
|
| Asset Class |
[3] |
2.9
|
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] |
25.9
|
23.2
|
|
| Cash and Cash Equivalents [Member] | Level 2 [Member] | Pension Plan [Member] |
|
|
|
|
| Pension and Other Postretirement Plans' Assets |
|
|
|
|
| Asset Class |
[2] |
51.0
|
64.9
|
|
| 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] |
$ 19.5
|
$ 29.3
|
|
| Year End Allocation |
|
|
|
|
| Total |
[4] |
0.50%
|
0.70%
|
|
| Other - Pending Transactions and Accrued Income [Member] | Other Postretirement Benefit Plans [Member] |
|
|
|
|
| Pension and Other Postretirement Plans' Assets |
|
|
|
|
| Asset Class |
[5] |
$ (6.9)
|
$ 4.8
|
|
| Year End Allocation |
|
|
|
|
| Total |
[5] |
(0.40%)
|
0.30%
|
|
| Other - Pending Transactions and Accrued Income [Member] | Other [Member] | Pension Plan [Member] |
|
|
|
|
| Pension and Other Postretirement Plans' Assets |
|
|
|
|
| Asset Class |
[4] |
$ 19.4
|
$ 29.3
|
|
| Other - Pending Transactions and Accrued Income [Member] | Other [Member] | Other Postretirement Benefit Plans [Member] |
|
|
|
|
| Pension and Other Postretirement Plans' Assets |
|
|
|
|
| Asset Class |
[5] |
(6.9)
|
4.8
|
|
| 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] |
0.1
|
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
|
|
|
|