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Regulatory Matters (Tables) | 12 Months Ended
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Dec. 31, 2024
Regulatory Assets and Liabilities Disclosure [Abstract] |
Regulatory Assets | Regulatory assets were comprised of the following items:
At December 31, (in millions) | 2024 |  | 2023
Regulatory Assets |  |  |
Unrecognized pension and other postretirement benefit costs (see Note 16) | $ | 485.3 |  |  | $ | 561.6 |
Deferred pension and other postretirement benefit costs (see Note 16) | 45.3 |  |  | 59.7 |
Environmental costs (see Note 19-D.) | 42.8 |  |  | 40.6 |
Regulatory effects of accounting for income taxes (see Note 1-N. and Note 15) | 172.0 |  |  | 163.5 |
Under-recovered gas and fuel costs (see Note 1-J.) | 82.3 |  |  | 12.7 |
Depreciation | 214.9 |  |  | 201.9 |
Post-in-service carrying charges | 280.8 |  |  | 269.9 |
Safety activity costs | 203.7 |  |  | 206.6 |
DSM programs | 17.8 |  |  | 25.0 |
Retired coal generating stations | 617.0 |  |  | 682.0 |
Losses on commodity price risk programs (See Note 13) | 6.5 |  |  | 24.4 |
Deferred property taxes | 75.9 |  |  | 72.3 |
Renewable energy investments | 81.3 |  |  | 60.8 |
WAM system filing | 21.5 |  |  | — |
Customer assistance programs | 24.4 |  |  | — |
Other | 105.8 |  |  | 79.2 |
Total Regulatory Assets | $ | 2,477.3 |  |  | $ | 2,460.2 |
Less: Current Portion | 319.9 |  |  | 214.3 |
Total Noncurrent Regulatory Assets | $ | 2,157.4 |  |  | $ | 2,245.9 |
Regulatory Liabilities | Regulatory liabilities were comprised of the following items:
At December 31, (in millions) | 2024 |  | 2023
Regulatory Liabilities |  |  |
Over-recovered gas and fuel costs (see Note 1-J.) | $ | 21.4 |  |  | $ | 144.5 |
Cost of removal (see Note 11) | 482.8 |  |  | 597.2 |
Regulatory effects of accounting for income taxes (see Note 1-N. and Note 15) | 827.0 |  |  | 849.9 |
Deferred pension and other postretirement benefit costs (see Note 16) | 40.4 |  |  | 54.0 |
Gains on commodity price risk programs (See Note 13) | 28.7 |  |  | 23.3 |
Customer assistance programs | 9.4 |  |  | 19.8 |
Off-system sales sharing | 21.4 |  |  | 19.0 |
Renewable energy investments (See Note 1-S. and Note 4) | 77.0 |  |  | 18.1 |
Rate refunds | 16.6 |  |  | 16.1 |
Other | 57.0 |  |  | 47.4 |
Total Regulatory Liabilities | $ | 1,581.7 |  |  | $ | 1,789.3 |
Less: Current Portion | 150.5 |  |  | 278.6 |
Total Noncurrent Regulatory Liabilities | $ | 1,431.2 |  |  | $ | 1,510.7 |

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- Definition Tabular disclosure of assets that are created when regulatory agencies permit public utilities to defer certain costs included in rate-setting to the balance sheet. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 340 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478742/980-340-50-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 980 -SubTopic 715 -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478574/980-715-50-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478742/980-340-50-2 + Details
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- Definition Tabular disclosure of regulatory liabilities. Detailed information about liabilities that result from rate actions of a regulator. Rate actions of a regulator can impose a liability on a regulated enterprise resulting in a regulatory liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 405 -Name Accounting Standards Codification -Section 25 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477571/980-405-25-1 + Details
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