Components of Accrued Revenue (Detail) - USD ($) $ in Millions |
Jun. 30, 2025 |
Dec. 31, 2024 |
Jun. 30, 2024 |
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Deferred Revenue Arrangement [Line Items] | |||||
Regulatory Assets, Current | [1] | $ 52.6 | $ 70.1 | $ 61.1 | |
Total Accrued Revenue | 56.8 | 77.4 | 65.9 | ||
Unbilled Revenues | |||||
Deferred Revenue Arrangement [Line Items] | |||||
Regulatory Assets, Current | 4.2 | 7.3 | 4.8 | ||
Regulatory Assets | |||||
Deferred Revenue Arrangement [Line Items] | |||||
Regulatory Assets, Current | $ 52.6 | $ 70.1 | $ 61.1 | ||
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