Segment Reporting (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Segment Reporting [Abstract]
Revenues	$ 5,445,916	$ 4,728,325	$ 15,861,622	$ 13,365,592
Operating Income (Loss)	401,592	229,466	1,056,330	581,589
Adjusted EBITDA	$ 465,896	$ 330,260	$ 1,274,478	$ 856,054
Adjusted EBITDA Margin %	8.60%	7.00%	8.00%	6.40%
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 5,445,916	$ 4,728,325	$ 15,861,622	$ 13,365,592
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating Income (Loss)	401,592	229,466	1,056,330	581,589
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	14,080,564		14,080,564		$ 12,617,699
EES
Segment Reporting [Abstract]
Adjusted EBITDA	$ 225,764	$ 173,898	$ 653,630	$ 453,894
Adjusted EBITDA Margin %	10.10%	8.80%	9.80%	8.10%
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 2,234,771	$ 1,982,485	$ 6,654,883	$ 5,626,309
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	4,541,553		4,541,553		4,098,335
CSS
Segment Reporting [Abstract]
Adjusted EBITDA	$ 156,370	$ 133,701	$ 429,452	$ 355,521
Adjusted EBITDA Margin %	9.80%	9.00%	9.30%	8.50%
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 1,602,459	$ 1,488,689	$ 4,638,631	$ 4,200,424
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	4,988,009		4,988,009		4,601,132
UBS
Segment Reporting [Abstract]
Adjusted EBITDA	$ 186,257	$ 114,674	$ 491,652	$ 299,030
Adjusted EBITDA Margin %	11.60%	9.10%	10.80%	8.40%
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 1,608,686	$ 1,257,151	$ 4,568,108	$ 3,538,859
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	3,817,459		3,817,459		3,266,231
Corporate Segment
Segment Reporting [Abstract]
Adjusted EBITDA	(102,495)	(92,013)	(300,256)	(252,391)
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0	$ 0	0	$ 0
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	$ 733,543		$ 733,543		$ 652,001