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Segment Reporting (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Segment Reporting [Abstract]      
Revenues $ 4,932,181 $ 4,041,477  
Operating Income (Loss) 284,029 133,251  
Adjusted EBITDA $ 364,122 $ 216,548  
Adjusted EBITDA Margin % 7.40% 5.40%  
Segment Reporting, Revenue Reconciling Item [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax $ 4,932,181 $ 4,041,477  
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Operating Income (Loss) 284,029 133,251  
Segment Reporting, Asset Reconciling Item [Line Items]      
Assets 13,185,033   $ 12,617,699
EES      
Segment Reporting [Abstract]      
Adjusted EBITDA $ 192,417 $ 112,025  
Adjusted EBITDA Margin % 9.20% 6.50%  
Segment Reporting, Revenue Reconciling Item [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax $ 2,089,959 $ 1,720,813  
Segment Reporting, Asset Reconciling Item [Line Items]      
Assets 4,336,938   4,098,335
CSS      
Segment Reporting [Abstract]      
Adjusted EBITDA $ 123,040 $ 90,682  
Adjusted EBITDA Margin % 8.60% 7.30%  
Segment Reporting, Revenue Reconciling Item [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax $ 1,434,175 $ 1,250,615  
Segment Reporting, Asset Reconciling Item [Line Items]      
Assets 4,650,849   4,601,132
UBS      
Segment Reporting [Abstract]      
Adjusted EBITDA $ 136,360 $ 83,653  
Adjusted EBITDA Margin % 9.70% 7.80%  
Segment Reporting, Revenue Reconciling Item [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax $ 1,408,047 $ 1,070,049  
Segment Reporting, Asset Reconciling Item [Line Items]      
Assets 3,513,628   3,266,231
Corporate Segment      
Segment Reporting [Abstract]      
Adjusted EBITDA (87,695) (69,812)  
Segment Reporting, Revenue Reconciling Item [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 0 $ 0  
Segment Reporting, Asset Reconciling Item [Line Items]      
Assets $ 683,618   $ 652,001