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Revenue Recognition - Disaggregated revenues (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Revenue Recognition
Total revenue	$ 3,382.4	$ 3,266.7
Cost reimbursable
Revenue Recognition
Total revenue	1,514.9	1,307.6
Guaranteed maximum price
Revenue Recognition
Total revenue	1,088.2	1,067.7
Fixed price
Revenue Recognition
Total revenue	779.3	891.4
Americas
Revenue Recognition
Total revenue	2,579.6	2,464.2
Europe, Middle East, India, Africa
Revenue Recognition
Total revenue	448.0	440.9
Asia-Australia-Pacific
Revenue Recognition
Total revenue	$ 354.8	$ 361.6

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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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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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