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Fair Value Measurements - Narrative (Details) - USD ($) $ in Billions | Dec. 31, 2023 | Sep. 30, 2023
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Fair Value [Line Items] |  |
Fair value of long term debt | $ 8.2 | $ 7.5
Quoted Prices in Active Markets (Level 1) |  |
Fair Value [Line Items] |  |
Fair value of long term debt | 7.8 | 7.1
Significant Other Observable Inputs (Level 2) |  |
Fair Value [Line Items] |  |
Fair value of long term debt | $ 0.4 | $ 0.4

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