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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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- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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