Goodwill And Other Intangible Assets (Rollforward of Other Intangible Assets) (Details) (USD $)	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013	Dec. 31, 2013
Other Intangible Assets [Line Items]
Other intangible assets, gross carrying amount				$ 245,100,000
Accumulated amortization, amortizing intangible assets				(79,500,000)
Other Intangible Assets [Rollforward]
Other intangible assets, net, beginning balance	165,606,000
Additions from new business combinations, other intangible assets	12,000,000
Amortization of intangible assets	(4,600,000)		(4,200,000)
Other intangible assets, net, ending balance	171,562,000
Other Intangible Assets [Member]
Other Intangible Assets [Rollforward]
Currency translation adjustments, other intangible assets	(1,400,000)
Customer Relationships and Backlog [Member]
Other Intangible Assets [Line Items]
Other intangible assets, amortizing, gross carrying amount				128,400,000
Accumulated amortization, amortizing intangible assets				(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	11,700,000
Amortization of intangible assets	(4,200,000)
Currency translation adjustments, amortizing intangible assets	(200,000)
Other intangible assets, net, amortizing, ending balance	68,000,000
Other Finite-Lived Intangible Assets [Member]
Other Intangible Assets [Line Items]
Other intangible assets, amortizing, gross carrying amount				22,500,000	[1]
Accumulated amortization, amortizing intangible assets				(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	300,000	[1]
Amortization of intangible assets	(400,000)	[1]
Currency translation adjustments, amortizing intangible assets	(100,000)	[1]
Other intangible assets, net, amortizing, ending balance	10,500,000	[1]
Trade Names [Member]
Other Intangible Assets [Line Items]
Other intangible assets, non-amortizing, gross carrying amount	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
Pre-Qualifications [Member]
Other Intangible Assets [Line Items]
Other intangible assets, non-amortizing, gross carrying amount	58,300,000
Other Intangible Assets [Rollforward]
Other intangible assets, non-amortizing, beginning balance	59,400,000
Additions from new business combinations, non-amortizing intangible assets	0
Currency translation adjustments, non-amortizing intangible assets	(1,100,000)
Other intangible assets, non-amortizing, ending balance	$ 58,300,000

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