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Segment Reporting (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Segment Reporting [Abstract]      
Revenues $ 4,041,477 $ 1,968,647  
Operating Income (Loss) 133,251 60,913  
Segment Reporting, Revenue Reconciling Item [Line Items]      
Revenues 4,041,477 1,968,647  
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Operating Income (Loss) 133,251 60,913  
Revenues 4,041,477 1,968,647  
Revenue from Contract with Customer, Excluding Assessed Tax 4,041,477 1,968,647  
Segment Reporting, Asset Reconciling Item [Line Items]      
Assets 11,878,270   $ 11,880,214
EES      
Segment Reporting [Abstract]      
Operating Income (Loss) 100,111 43,326  
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Operating Income (Loss) 100,111 43,326  
Revenue from Contract with Customer, Excluding Assessed Tax 1,720,813 1,114,457  
CSS      
Segment Reporting [Abstract]      
Operating Income (Loss) 73,964 9,946  
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Operating Income (Loss) 73,964 9,946  
Revenue from Contract with Customer, Excluding Assessed Tax 1,250,615 223,726  
UBS      
Segment Reporting [Abstract]      
Operating Income (Loss) 87,030 41,785  
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Operating Income (Loss) 87,030 41,785  
Revenue from Contract with Customer, Excluding Assessed Tax 1,070,049 630,464  
Corporate Segment      
Segment Reporting [Abstract]      
Operating Income (Loss) (127,854) (34,144)  
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Operating Income (Loss) (127,854) (34,144)  
Revenue from Contract with Customer, Excluding Assessed Tax $ 0 $ 0