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Stockholder's Equity - Accumulated Other Comprehensive Income (Loss) - Changes in Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning balance |  |  | $ (1.7) | $ (2.8)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax |  |  | (0.3) | 2.1
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  |  | (0.8) | (0.9)
Net current-period other comprehensive income (loss) | $ (0.5) | $ 0.2 | (1.1) | 1.2
Ending balance | (2.8) | (1.6) | (2.8) | (1.6)
Proceeds from Issuance of Common Stock, Dividend Reinvestment Plan |  |  | 61.2 | 2.5
Proceeds from Issuance of Common Stock, Dividend Reinvestment Plan |  |  | 61.2 | 2.5
Maximum [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Proceeds from Stock Plans |  |  | 100.0 |
Proceeds from Stock Plans |  |  | 100.0 |
UnrealizedGainsLossesFromDefinedBenefitPensionAndPostretirementPlanItems [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning balance |  |  | (2.1) | (2.6)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax |  |  | 0.0 |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  |  | 0.0 | 0.0
Net current-period other comprehensive income (loss) |  |  | 0.0 | 0.0
Ending balance | (2.1) | (2.6) | (2.1) | (2.6)
Accumulated (Gain) Loss from Commodity Contracts Cash Flows Hedges [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning balance |  |  | 0.4 | (0.3)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | (0.3) | 0.1 | 0.4 | 1.6
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | (0.1) | 0.1 | (0.6) | (0.7)
Net current-period other comprehensive income (loss) |  |  | (0.2) | 0.9
Ending balance | 0.2 | 0.6 | 0.2 | 0.6
Accumulated (Gain) Loss from Interest Rate Swap Cash Flows Hedges [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning balance |  |  | 0.0 | 0.1
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | 0.0 | 0.1 | (0.7) | 0.5
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  |  |  | (0.2)
Net current-period other comprehensive income (loss) |  |  | (0.9) | 0.3
Ending balance | $ (0.9) | $ 0.4 | $ (0.9) | $ 0.4

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