Acquisitions, Goodwill and Other Intangible Assets - 2021 Acquisitions (Details) $ in Thousands, shares in Millions	1 Months Ended	3 Months Ended	12 Months Ended
	May 31, 2021 USD ($)	Dec. 31, 2021 USD ($) yr	Dec. 31, 2021 USD ($) yr acquisition shares	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Business Combinations [Line Items]
Goodwill		$ 1,520,575	$ 1,520,575	$ 1,243,034	$ 1,221,400
Cash, net of cash acquired			1,244,603	24,971	179,481
Power Delivery
Business Combinations [Line Items]
Goodwill		326,800	$ 326,800	$ 150,100	$ 149,900
2021 Acquisitions
Business Combinations [Line Items]
Business combinations, number of acquisitions | acquisition			14
Amortizing intangible assets		563,100	$ 563,100
Goodwill		277,300	277,300
Business combinations, goodwill, expected tax deductible amount		125,000	125,000
Bargain purchase gain			3,500
Total consideration transferred			1,567,300
Shares transferred			181,700
Business combinations, contingent consideration, earn-out liabilities		101,600	101,600
Business combinations, contingent consideration liabilities, range of potential undiscounted earn-out liabilities, low		12,000	12,000
Business combinations, contingent consideration liabilities, range of potential undiscounted earn-out liabilities, high		$ 164,000	164,000
Cash, net of cash acquired			$ 1,284,000
2021 Acquisitions | Minimum | Expected Term
Business Combinations [Line Items]
Business combinations, contingent consideration, earn-out period (in years) | yr		1	1
2021 Acquisitions | Maximum | Expected Term
Business Combinations [Line Items]
Business combinations, contingent consideration, earn-out period (in years) | yr		5	5
2021 Acquisitions | Power Delivery
Business Combinations [Line Items]
Bargain purchase gain		$ 3,500
HMG
Business Combinations [Line Items]
Business combinations, acquired finite-lived intangible assets, weighted average lives (in years)			14 years
Amortizing intangible assets		112,000	$ 112,000
Goodwill		120,800	120,800
Bargain purchase gain			0
Total consideration transferred			$ 598,600
Business acquisition, number of shares issued (in shares) | shares			2.0
Shares transferred			$ 181,700
Business combinations, contingent consideration, earn-out liabilities		0	0
Cash, net of cash acquired			$ 416,900
HMG | Customer Relationships
Business Combinations [Line Items]
Business combinations, acquired finite-lived intangible assets, weighted average lives (in years)			13 years
HMG | Trade Names
Business Combinations [Line Items]
Business combinations, acquired finite-lived intangible assets, weighted average lives (in years)			20 years
All other
Business Combinations [Line Items]
Business combinations, acquired finite-lived intangible assets, weighted average lives (in years)			16 years
Amortizing intangible assets		451,100	$ 451,100
Goodwill		156,500	156,500
Bargain purchase gain			3,500
Total consideration transferred			968,700
Shares transferred			0
Business combinations, contingent consideration, earn-out liabilities		101,600	101,600
Cash, net of cash acquired			867,100
All other | Power Delivery
Business Combinations [Line Items]
Goodwill		$ 49,000	49,000
Total consideration transferred	$ 452,000
Cash, net of cash acquired			$ 78,000
All other | Power Delivery | Minimum | Expected Term
Business Combinations [Line Items]
Business combinations, contingent consideration, earn-out period (in years) | yr		1	1
All other | Customer Relationships
Business Combinations [Line Items]
Business combinations, acquired finite-lived intangible assets, weighted average lives (in years)			17 years
All other, INTREN acquisition | Customer Relationships And Trade Names | Power Delivery
Business Combinations [Line Items]
Business combinations, acquired finite-lived intangible assets, weighted average lives (in years)			20 years
Amortizing intangible assets		$ 281,000	$ 281,000