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Revenue - Narrative (Details) $ in Thousands | Nov. 22, 2023 USD ($) mi² term | Dec. 31, 2023 USD ($) | Sep. 30, 2023 USD ($) | Mar. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Sep. 30, 2022 USD ($) | Mar. 31, 2022 USD ($)
--- | --- | --- | --- | --- | --- | --- | ---
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Prepayments received |  | $ 107,060 | $ 80,265 | $ 60,759 | $ 61,367 | $ 53,945 | $ 54,678
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01 |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Remaining performance obligation, amount |  | $ 188,500 |  |  |  |  |
Remaining performance obligation, expected timing of satisfaction, period |  | 30 years |  |  |  |  |
Tampa Electric Company | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Agreement term | 20 years |  |  |  |  |  |
Number of agreement extension terms | term | 2 |  |  |  |  |  |
Agreement extension term | 10 years |  |  |  |  |  |
Service area | mi² | 2,000 |  |  |  |  |  |
Total scheduled prepayments | $ 34,500 |  |  |  |  |  |
Prepayments received |  | $ 6,900 |  |  |  |  |

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