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Discontinued Operations, Goodwill, and Intangible Assets - Sale of businesses (Details) - Disposal by Sale - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2024	Mar. 31, 2024	Mar. 31, 2023	Sep. 30, 2024
Civil infrastructure construction business
Discontinued Operations, Goodwill and Intangible Assets
Gain(loss) from sale of discontinued business	$ 12.7
Committing fund	$ 30.0
Cash outflow to fund credit facility				$ 21.0
Oil and gas construction business
Discontinued Operations, Goodwill and Intangible Assets
Gain(loss) from sale of discontinued business		$ (103.1)	$ (38.9)

X

- Definition

The amount of cash outflow as of reporting date to fund a credit facility commitment to the counter party in the sale of a business, classified as discontinued operations.

+ References

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- Definition

Amount of investment obligation, to be paid to the borrower pursuant to revolving credit facility.

+ References

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- Definition

Amount of gain (loss) from sale and disposal of integrated set of activities and assets capable of being conducted and managed for purpose of providing return in form of dividend, lower cost, or other economic benefit to investor, owner, member and participant.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-28

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 810
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481203/810-10-50-1B

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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.

+ References

No definition available.

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