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Regulatory Matters (Tables) | 12 Months Ended
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Dec. 31, 2023
Regulated Operations [Abstract] |
Schedule of Regulatory Assets and Liabilities | We had the following regulatory assets and liabilities as of December 31 (in millions):
| 2023 |  | 2022 |
Regulatory assets |  |  |  |
Winter Storm Uri (a) | $ | 199.6 |  | $ | 348.0 |
Deferred energy and fuel cost adjustments (b) |  | 55.1 |  |  | 72.6 |
Deferred gas cost adjustments (b) |  | 4.1 |  |  | 12.2 |
Gas price derivatives (b) |  | 5.1 |  |  | 8.8 |
Deferred taxes on AFUDC (b) |  | 7.1 |  |  | 7.3 |
Employee benefit plans and related deferred taxes (c) |  | 89.3 |  |  | 89.3 |
Environmental (b) |  | 2.9 |  |  | 1.3 |
Loss on reacquired debt (b) |  | 17.4 |  |  | 19.2 |
Deferred taxes on flow-through accounting (b) |  | 74.7 |  |  | 69.5 |
Decommissioning costs (b) |  | 2.4 |  |  | 3.5 |
Other regulatory assets (b) |  | 22.4 |  |  | 21.3 |
Total regulatory assets |  | 480.1 |  |  | 653.0 |
Less current regulatory assets |  | (175.7 | ) |  | (260.3 | )
Regulatory assets, non-current | $ | 304.4 |  | $ | 392.7 |
Regulatory liabilities |  |  |  |
Deferred energy and gas costs (b) | $ | 88.9 |  | $ | 41.7 |
Employee benefit plans and related deferred taxes (c) |  | 36.2 |  |  | 38.9 |
Cost of removal (b) |  | 181.9 |  |  | 175.6 |
Excess deferred income taxes (c) |  | 247.1 |  |  | 254.8 |
Other regulatory liabilities (c) |  | 12.5 |  |  | 7.6 |
Total regulatory liabilities |  | 566.6 |  |  | 518.6 |
Less current regulatory liabilities |  | (98.9 | ) |  | (46.0 | )
Regulatory liabilities, non-current | $ | 467.7 |  | $ | 472.6 |
(a) Timing of Winter Storm Uri incremental cost recovery and associated carrying costs vary by jurisdiction. See further information below. (b) Recovery/repayment of costs, but we are not allowed a rate of return. (c) In addition to recovery or repayment of costs, we are allowed a return on a portion of this amount or a reduction in rate base.

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