Segment Reporting (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Segment Reporting [Abstract]
Revenues	$ 4,595,790	$ 2,086,706	$ 8,637,267	$ 4,055,353
Operating Income (Loss)	218,872	15,270	352,123	76,183
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	4,595,790	2,086,706	8,637,267	4,055,353
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating Income (Loss)	218,872	15,270	352,123	76,183
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	12,299,079		12,299,079		$ 11,880,214
EES
Segment Reporting [Abstract]
Operating Income (Loss)	153,740	45,809	253,852	89,135
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1,923,011	1,043,294	3,643,824	2,157,766
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating Income (Loss)	153,740	45,809	253,852	89,135
CSS
Segment Reporting [Abstract]
Operating Income (Loss)	111,257	27,922	185,220	37,868
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1,461,120	341,470	2,711,735	565,185
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating Income (Loss)	111,257	27,922	185,220	37,868
UBS
Segment Reporting [Abstract]
Operating Income (Loss)	94,693	51,774	181,723	93,559
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1,211,659	701,942	2,281,708	1,332,402
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating Income (Loss)	94,693	51,774	181,723	93,559
Corporate Segment
Segment Reporting [Abstract]
Operating Income (Loss)	(140,818)	(110,235)	(268,672)	(144,379)
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0	0	0	0
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating Income (Loss)	$ (140,818)	$ (110,235)	$ (268,672)	$ (144,379)