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Organization and Summary of Significant Accounting Policies - Investments (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Equity Method Investees    
Equity method investments $ 1,827.0 $ 1,774.9
Penske Truck Leasing Co LP    
Equity Method Investees    
Equity method investments $ 1,803.9 $ 1,725.1