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		6 Months Ended		12 Months Ended
	May 31, 2022	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Business Acquisition [Line Items]
Business combinations, unaudited supplemental pro forma revenue		$ 2,900.0	$ 3,000.0	$ 5,400.0	$ 5,300.0
Business combinations, unaudited supplemental pro forma net income (loss)		14.5	27.2	(68.7)	(47.4)
Business combinations, consolidated acquisition-related revenue		569.7	602.3	970.3	1,307.0
Business combinations, consolidated acquisition-related income (loss)		(13.3)	$ 18.7	(41.5)	9.4
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]
Unrealized gain (loss) included in other income		(3.8)	$ 3.2	$ (5.4)	3.2
Total consideration	$ 29.4
Business acquisition, cash payment	$ 18.0
Business acquisition, number of shares issued (in shares)	133,157			160,000		170,000
Business combination, contingent consideration, current		40.0		$ 40.0		$ 37.0
HMG | Contingent Consideration, Collections From Acquired Receivables
Business Acquisition [Line Items]
Unrealized gain (loss) included in other income				$ 10.4
Business acquisition, number of shares issued (in shares)				87,900
Estimated fair value of contingent consideration		19.4		$ 19.4
IEA
Business Acquisition [Line Items]
Total consideration				748.5
Estimated fair value of contingent consideration		0.0		0.0
2021 Acquisitions, Henkels & McCoy Group, Inc. and INTREN
Business Acquisition [Line Items]
Business combinations, consolidated acquisition-related revenue			480.4		1,028.5
2023 Acquisitions, Infrastructure Energy Alternatives, Inc.
Business Acquisition [Line Items]
Business combinations, consolidated acquisition-related revenue		520.6		$ 890.6
2023 Acquisitions
Business Acquisition [Line Items]
Business acquisition, number of shares issued (in shares)				120,000
Business combination, acquisition and integration related costs		22.7		$ 39.8
2023 Acquisitions | General and Administrative Expense
Business Acquisition [Line Items]
Business combination, acquisition and integration related costs		20.4		35.0
2023 Acquisitions | Cost of Revenue, Excluding Depreciation and Amortization
Business Acquisition [Line Items]
Business combination, acquisition and integration related costs		2.3		4.8
2022 Acquisitions
Business Acquisition [Line Items]
Total consideration				799.7
Estimated fair value of contingent consideration		2.8		2.8		3.0
2022 Acquisitions | General and Administrative Expense
Business Acquisition [Line Items]
Business combination, acquisition and integration related costs			$ 12.5		$ 26.1
2022 and 2023 Acquisitions
Business Acquisition [Line Items]
Business combination, integration related liabilities		$ 7.0		$ 7.0		$ 5.5