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Income Taxes - Cash Paid for Taxes, Net of Refunds (Details) - USD ($) $ in Millions | 9 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024
Disclosures by Disposal Group [Line Items] |  |
Income tax payments, net of refunds | $ 856.1 | $ 502.2
Disposal Group, Disposed of by Sale, Not Discontinued Operations | LNG |  |
Disclosures by Disposal Group [Line Items] |  |
Income tax payments, net of refunds | $ 395.0 |

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