Acquisitions, Goodwill, and Other Intangible Assets, Net - HMG Additional Payments, Pro Forma Financial Information, Acquisition Results, and Acquisition and Integration Costs - Narrative (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended			12 Months Ended
	May 31, 2022	Mar. 31, 2023	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2022
Business Acquisition [Line Items]
Business combinations, unaudited supplemental pro forma revenue		$ 2,600.0		$ 2,300.0
Business combinations, unaudited supplemental pro forma net income (loss)		(83.2)		(74.6)
Business combinations, consolidated acquisition-related revenue		400.6		704.7
Business combinations, consolidated acquisition-related income (loss)		(34.1)		(4.3)
HMG
Business Acquisition [Line Items]
Business acquisition, number of shares issued (in shares)			133,000
HMG | Contingent Consideration, Value Of Common Stock
Business Acquisition [Line Items]
Total consideration	$ 29.4
Business acquisition, cash payment	$ 18.0
Business acquisition, number of shares issued (in shares)	133,157
Business combination, contingent consideration, current		$ 39.0			$ 37.0
HMG | Contingent Consideration, Value Of Common Stock | Power Delivery
Business Acquisition [Line Items]
Business acquisition, number of shares issued (in shares)		170,000			170,000
Unrealized gain (loss) included in other income		$ (1.6)
HMG | Contingent Consideration, Collections From Acquired Receivables
Business Acquisition [Line Items]
Business acquisition, number of shares issued (in shares)		98,800			98,800
Unrealized gain (loss) included in other income		$ 9.3			$ 8.4
Estimated fair value of contingent consideration		21.8			21.8
IEA
Business Acquisition [Line Items]
Total consideration		748.5
Estimated fair value of contingent consideration		0.0
2021 Acquisitions, Henkels & McCoy Group, Inc. and INTREN
Business Acquisition [Line Items]
Business combinations, consolidated acquisition-related revenue				548.1
2023 Acquisitions, Infrastructure Energy Alternatives, Inc.
Business Acquisition [Line Items]
Business combinations, consolidated acquisition-related revenue		$ 370.0
2023 Acquisitions
Business Acquisition [Line Items]
Business acquisition, number of shares issued (in shares)		120,000
Business combination, acquisition and integration related costs		$ 17.1
2023 Acquisitions | General and Administrative Expense
Business Acquisition [Line Items]
Business combination, acquisition and integration related costs		14.6
2023 Acquisitions | Cost of Revenue, Excluding Depreciation and Amortization
Business Acquisition [Line Items]
Business combination, acquisition and integration related costs		2.5
2022 Acquisitions
Business Acquisition [Line Items]
Total consideration		799.7
Estimated fair value of contingent consideration		2.8			3.0
2022 Acquisitions | General and Administrative Expense
Business Acquisition [Line Items]
Business combination, acquisition and integration related costs				$ 13.6
2022 and 2023 Acquisitions
Business Acquisition [Line Items]
Business combination, integration related liabilities		$ 1.9			$ 5.5