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Acquisitions, Dispositions and Impairments (Tables) | 12 Months Ended
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Dec. 31, 2023
Lease Rental Costs |
Year Ended December 31, 2023 |  | AEP |  | AEP Texas |  | AEPTCo |  | APCo |  | I&M |  | OPCo |  | PSO |  | SWEPCo
|  | (in millions)
Operating Lease Cost |  | $ | 149.9 |  |  | $ | 34.0 |  |  | $ | 1.3 |  |  | $ | 18.5 |  |  | $ | 19.6 |  |  | $ | 17.3 |  |  | $ | 13.5 |  |  | $ | 17.5 |
Finance Lease Cost: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of Right-of-Use Assets |  | 69.1 |  |  | 7.4 |  |  | — |  |  | 8.3 |  |  | 7.3 |  |  | 5.0 |  |  | 3.3 |  |  | 19.9 |
Interest on Lease Liabilities |  | 11.9 |  |  | 1.4 |  |  | — |  |  | 1.8 |  |  | 2.5 |  |  | 0.9 |  |  | 0.7 |  |  | 1.4 |
Total Lease Rental Costs (a) |  | $ | 230.9 |  |  | $ | 42.8 |  |  | $ | 1.3 |  |  | $ | 28.6 |  |  | $ | 29.4 |  |  | $ | 23.2 |  |  | $ | 17.5 |  |  | $ | 38.8 |
Year Ended December 31, 2022 |  | AEP |  | AEP Texas |  | AEPTCo |  | APCo |  | I&M |  | OPCo |  | PSO |  | SWEPCo
|  | (in millions)
Operating Lease Cost |  | $ | 157.5 |  |  | $ | 18.4 |  |  | $ | 1.1 |  |  | $ | 17.9 |  |  | $ | 29.5 |  |  | $ | 16.9 |  |  | $ | 11.8 |  |  | $ | 15.3 |
Finance Lease Cost: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of Right-of-Use Assets |  | 205.5 |  |  | 6.8 |  |  | — |  |  | 7.9 |  |  | 78.7 |  |  | 4.9 |  |  | 3.2 |  |  | 10.8 |
Interest on Lease Liabilities |  | 13.4 |  |  | 1.3 |  |  | — |  |  | 2.0 |  |  | 3.1 |  |  | 0.8 |  |  | 0.6 |  |  | 2.1 |
Total Lease Rental Costs (a) |  | $ | 376.4 |  |  | $ | 26.5 |  |  | $ | 1.1 |  |  | $ | 27.8 |  |  | $ | 111.3 |  |  | $ | 22.6 |  |  | $ | 15.6 |  |  | $ | 28.2 |
Year Ended December 31, 2021 |  | AEP |  | AEP Texas |  | AEPTCo |  | APCo |  | I&M |  | OPCo |  | PSO |  | SWEPCo
|  | (in millions)
Operating Lease Cost |  | $ | 275.3 |  |  | $ | 18.4 |  |  | $ | 1.7 |  |  | $ | 19.3 |  |  | $ | 90.2 |  |  | $ | 19.0 |  |  | $ | 8.7 |  |  | $ | 12.1 |
Finance Lease Cost: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of Right-of-Use Assets |  | 74.7 |  |  | 6.7 |  |  | — |  |  | 7.7 |  |  | 12.9 |  |  | 4.9 |  |  | 3.2 |  |  | 11.0 |
Interest on Lease Liabilities |  | 14.4 |  |  | 1.4 |  |  | — |  |  | 2.4 |  |  | 3.0 |  |  | 0.8 |  |  | 0.6 |  |  | 2.5 |
Total Lease Rental Costs (a) |  | $ | 364.4 |  |  | $ | 26.5 |  |  | $ | 1.7 |  |  | $ | 29.4 |  |  | $ | 106.1 |  |  | $ | 24.7 |  |  | $ | 12.5 |  |  | $ | 25.6 |
(a)Excludes variable and short-term lease costs, which were immaterial.

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- Definition Tabular disclosure of lessee's lease cost. Includes, but is not limited to, interest expense for finance lease, amortization of right-of-use asset for finance lease, operating lease cost, short-term lease cost, variable lease cost and sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-4 + Details
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