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Revenue Recognition - Accounts receivable, net (Details) $ in Millions	9 Months Ended	12 Months Ended
	Jun. 30, 2019 USD ($) client	Sep. 30, 2018 USD ($) client
Additional disclosures
Unbilled receivables are expected to be billed and collected (in months)	12 months	12 months
Significant claims recorded in contract assets and other non-current assets	$ 360.0	$ 266.0
Trade receivables sold, outstanding	369.1	334.2
Other than U.S government outstanding receivables
Billed	2,767.1	2,697.7
Contract retentions	656.1	661.7
Total accounts receivable-gross	3,423.2	3,359.4
Allowance for doubtful accounts	(49.8)	(51.6)
Total accounts receivable-net	$ 3,373.4	$ 3,307.8
Additional disclosures
Number of clients | client	0	0
Outstanding receivables (as a percent)	10.00%	10.00%

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- Definition

The amounts in excess of the agreed contract price (or amounts not included in the original contract price) that the company seeks to collect from customers or others for delays, errors in specifications and designs, contract terminations, change orders in dispute or unapproved as to both scope and price or other causes of unanticipated additional costs recorded in contract assets and other non current assets.

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Description of risks that arise due to the volume of business transacted with a particular customer. At a minimum, the description informs financial statement users of the general nature of the risk, but excludes "Information about Major Customers" that may be disclosed elsewhere (for instance, segment disclosures).

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Amount, before allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

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Amount of allowance for credit loss on accounts receivable, classified as current.

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Amounts due for billed services rendered or to be rendered, actions taken or to be taken, or a promise to refrain from taking certain actions in accordance with the terms of a legally binding agreement between the Company and, at a minimum, one other party. An example would be amounts billed to customers under contracts or programs but not paid as of the balance sheet date.

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Amount, after allowance for bad debt, of trade and loan receivables held-for-sale that are not part of a disposal group. Excludes loans and leases covered under loss sharing agreements and loans classified as debt securities.

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