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v3.24.0.1

Common Equity - Performance Units (Details) - Performance units - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Performance units granted |  | 157,035 | 171,492 | 152,382
Intrinsic value of settled performance units |  | $ 10.2 | $ 20.2 | $ 27.7
Tax benefit from distribution of performance units |  | $ 2.6 | $ 5.1 | $ 6.8
Performance units outstanding |  | 412,448 |  |
Liability recorded on balance sheet |  | $ 10.0 |  |
Compensation cost not yet recognized |  | $ 12.8 |  |
Weighted-average period over which unrecognized compensation cost is expected to be recognized |  | 1 year 10 months 24 days |  |
Subsequent event |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Performance units granted | 196,256 |  |  |
Intrinsic value of settled performance units | $ 1.0 |  |  |
Tax benefit from distribution of performance units | $ 0.2 |  |  |

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