Acquisitions, Goodwill, and Other Intangible Assets - Rollforward of Other Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Other Intangible Assets [Line Items]
Other intangible assets, gross		$ 996,100
Accumulated amortization		(325,800)
Other Intangible Assets [Rollforward]
Other intangible assets, net, beginning balance	$ 670,280
Additions from new business combinations	2,300
Measurement period adjustments	45,700
Currency translation adjustments	300
Amortization expense	(25,600)
Other intangible assets, net, ending balance	692,989
Customer Relationships and Backlog
Other Intangible Assets [Line Items]
Other intangible assets, amortizing, gross		763,100
Accumulated amortization		(278,000)
Other Intangible Assets [Rollforward]
Other intangible assets, net, amortizing, beginning balance	485,100
Additions from new business combinations, amortizing intangible assets	1,600
Measurement period adjustments, amortizing intangible assets	55,800
Currency translation adjustments, amortizing intangible assets	0
Amortization expense	(20,300)
Other intangible assets, net, amortizing, ending balance	522,200
Pre-Qualifications
Other Intangible Assets [Line Items]
Other intangible assets, amortizing, gross		73,900
Accumulated amortization		(21,400)
Other Intangible Assets [Rollforward]
Other intangible assets, net, amortizing, beginning balance	52,500
Additions from new business combinations, amortizing intangible assets	0
Measurement period adjustments, amortizing intangible assets	0
Currency translation adjustments, amortizing intangible assets	300
Amortization expense	(2,200)
Other intangible assets, net, amortizing, ending balance	50,600
Other
Other Intangible Assets [Line Items]
Other intangible assets, amortizing, gross		124,600
Accumulated amortization		(26,400)
Other Intangible Assets [Rollforward]
Other intangible assets, net, amortizing, beginning balance	98,200
Additions from new business combinations, amortizing intangible assets	700
Measurement period adjustments, amortizing intangible assets	(10,100)
Currency translation adjustments, amortizing intangible assets	0
Amortization expense	(3,100)
Other intangible assets, net, amortizing, ending balance	85,700
Trade Names
Other Intangible Assets [Line Items]
Other intangible assets, non-amortizing	34,500	$ 34,500
Other Intangible Assets [Rollforward]
Other intangible assets, non-amortizing, beginning balance	34,500
Additions from new business combinations, non-amortizing intangible assets	0
Measurement period adjustments, non-amortizing intangible assets	0
Currency translation adjustments, non-amortizing intangible assets	0
Other intangible assets, non-amortizing, ending balance	$ 34,500