Goodwill And Other Intangible Assets (Narrative) (Details) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Net book value of intangible assets written off	$ 0		$ 0
Finite lived intangible assets, amortization expense	5.8	6.3	16.8	18.2
Estimated amortization expenses for the remainder of year 2011			5.5
Estimated amortization expenses for the year 2012			21.8
Estimated amortization expenses for the year 2013			20.1
Estimated amortization expenses for the year 2014			11.6
Estimated amortization expenses for the year 2015			10.7
Estimated amortization expenses for the year 2016			9.2
Estimated amortization expenses after the year 2016			40.1
Customer Relationships, Non-Competition Agreements, Tradenames And Contract Backlog [Member]
Write-off of fully amortized intangible assets related to customer relationships, non-competition agreements, tradenames and contract backlog			$ 26.5