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Fair Value Measurements - Narrative (Details) - USD ($)
$ in Billions
Dec. 31, 2024
Sep. 30, 2024
Fair Value [Line Items]    
Fair value of long term debt $ 8.6 $ 8.3
Quoted Prices in Active Markets (Level 1)    
Fair Value [Line Items]    
Fair value of long term debt 8.4 8.1
Significant Other Observable Inputs (Level 2)    
Fair Value [Line Items]    
Fair value of long term debt $ 0.2 $ 0.2