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Discontinued Operations, Goodwill, and Intangible Assets - Sale of businesses (Details) - Held for sale - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2024	Mar. 31, 2024	Mar. 31, 2023
Civil infrastructure construction business
Discontinued Operations, Goodwill and Intangible Assets
Gain based on the fair value equity	$ 12.7
Oil and gas construction business
Discontinued Operations, Goodwill and Intangible Assets
Amount of cash payment for contingent consideration collected		$ 103.1	$ 38.9
Revolving credit facility
Discontinued Operations, Goodwill and Intangible Assets
Committing fund	30.0
Fund outflow in other investing activities and outstanding	$ 27.1

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- Definition

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

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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
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
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The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period.

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