Goodwill And Other Intangible Assets (Rollforward of Other Intangible Assets) (Details) (USD $)	3 Months Ended			9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013	Sep. 30, 2014		Sep. 30, 2013	Dec. 31, 2013
Other Intangible Assets [Line Items]
Other intangible assets, gross carrying amount							$ 245,100,000
Accumulated amortization							(79,500,000)
Other Intangible Assets [Rollforward]
Other intangible assets, net, beginning balance				165,606,000
Additions from new business combinations, other intangible assets				77,000,000
Amortization expense	(6,600,000)		(5,800,000)	(17,000,000)		(15,200,000)
Currency translation adjustments, other intangible assets				(3,400,000)
Other intangible assets, net, ending balance	222,212,000			222,212,000
Customer Relationships and Backlog [Member]
Other Intangible Assets [Line Items]
Other intangible assets, amortizing, gross carrying amount							128,400,000
Accumulated amortization							(67,700,000)
Other Intangible Assets [Rollforward]
Other intangible assets, net, amortizing, beginning balance				60,700,000
Additions from new business combinations, amortizing intangible assets				33,100,000
Amortization expense				(15,700,000)
Currency translation adjustments, amortizing intangible assets				(800,000)
Other intangible assets, net, amortizing, ending balance	77,300,000			77,300,000
Other Amortizing Intangible Assets [Member]
Other Intangible Assets [Line Items]
Other intangible assets, amortizing, gross carrying amount							22,500,000	[1]
Accumulated amortization							(11,800,000)	[1]
Other Intangible Assets [Rollforward]
Other intangible assets, net, amortizing, beginning balance				10,700,000	[1]
Additions from new business combinations, amortizing intangible assets				2,700,000	[1]
Amortization expense				(1,300,000)	[1]
Currency translation adjustments, amortizing intangible assets				0	[1]
Other intangible assets, net, amortizing, ending balance	12,100,000	[1]		12,100,000	[1]
Trade Names [Member]
Other Intangible Assets [Line Items]
Other intangible assets, non-amortizing, gross carrying amount	34,800,000			34,800,000
Other Intangible Assets [Rollforward]
Other intangible assets, non-amortizing, beginning balance				34,800,000
Additions from new business combinations, non-amortizing intangible assets				0
Currency translation adjustments, non-amortizing intangible assets				0
Other intangible assets, non-amortizing, ending balance	34,800,000			34,800,000
Pre-Qualifications [Member]
Other Intangible Assets [Line Items]
Other intangible assets, non-amortizing, gross carrying amount	98,000,000			98,000,000
Other Intangible Assets [Rollforward]
Other intangible assets, non-amortizing, beginning balance				59,400,000
Additions from new business combinations, non-amortizing intangible assets				41,200,000
Currency translation adjustments, non-amortizing intangible assets				(2,600,000)
Other intangible assets, non-amortizing, ending balance	$ 98,000,000			$ 98,000,000

[1] Consists principally of amortizing trade names and non-compete agreements.