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Derivative Instruments - Fair Values of Derivative Contracts Recorded in Condensed Consolidated Balance Sheet (Detail) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Derivatives, Fair Value [Line Items]    
Energy Marketing Contracts Assets, Current $ 0.6 $ 0.6
Energy Marketing Contract Liabilities, Current 0.1 0.0
Energy Marketing Contract Liabilities, Total [1] 1.0 0.1
Energy Marketing Contracts Assets, Total [2] 0.7 0.7
Mark To Market Energy Assets [Member] | Propane Swap Agreement [Member] | Derivatives designated as hedging instrument [Member]    
Derivatives, Fair Value [Line Items]    
Energy Marketing Contracts Assets, Current 0.6 0.6
Mark To Market Energy Assets [Member] | Interest Rate Swap [Member] | Derivatives designated as hedging instrument [Member]    
Derivatives, Fair Value [Line Items]    
Energy Marketing Contracts Assets, Current 0.1 0.1
Mark-to-market energy liabilities [Member] | Propane Swap Agreement [Member] | Derivatives designated as hedging instrument [Member]    
Derivatives, Fair Value [Line Items]    
Energy Marketing Contract Liabilities, Current 0.0 0.0
Mark-to-market energy liabilities [Member] | Interest Rate Swap [Member] | Derivatives designated as hedging instrument [Member]    
Derivatives, Fair Value [Line Items]    
Energy Marketing Contract Liabilities, Current $ 1.0 $ 0.1
[1]
(1) Derivative liabilities, at fair value, include $0.1 million in current liabilities in the condensed consolidated balance sheet at March 31, 2025 and no current derivative liabilities at December 31, 2024, with the remainder of the balances classified as long-term.
[2]  (1) Derivative assets, at fair value, include $0.6 million in current assets in the condensed consolidated balance sheet at March 31, 2025 and $0.6 million at December 31, 2024, with the remainder of the balances classified as long-term