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Supplemental Information (Changes in Estimates) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Change in Accounting Estimate [Line Items] |  |  |  |
Operating income (loss) | $ 790.6 | $ 737.6 | $ (893.8) | $ 2,041.7
Contracts accounted for under percentage of completion |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |
Operating income (loss) | $ (20.0) | $ (50.0) | $ (63.0) | $ (115.0)

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