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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) |

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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 + Details
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