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Revenue Recognition - Disaggregated revenues (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2024 | Mar. 31, 2023
Revenue Recognition |  |  |  |
Total revenue | $ 3,943.9 | $ 3,490.1 | $ 7,843.8 | $ 6,872.5
Americas |  |  |  |
Revenue Recognition |  |  |  |
Total revenue | 3,039.1 | 2,630.3 | 6,077.9 | 5,209.9
Europe, Middle East, India, Africa |  |  |  |
Revenue Recognition |  |  |  |
Total revenue | 619.8 | 494.1 | 1,115.2 | 942.1
Asia-Australia-Pacific |  |  |  |
Revenue Recognition |  |  |  |
Total revenue | 285.0 | 365.7 | 650.7 | 720.5
Cost reimbursable |  |  |  |
Revenue Recognition |  |  |  |
Total revenue | 1,605.1 | 1,511.3 | 3,222.3 | 3,026.2
Guaranteed maximum price |  |  |  |
Revenue Recognition |  |  |  |
Total revenue | 1,420.7 | 1,151.0 | 2,835.6 | 2,239.2
Fixed-price |  |  |  |
Revenue Recognition |  |  |  |
Total revenue | $ 918.1 | $ 827.8 | $ 1,785.9 | $ 1,607.1

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