Goodwill And Intangible Assets (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Goodwill And Intangible Assets
Identifiable intangible assets minimum useful life (years)			1
Identifiable intangible assets maximum useful life (years)			20
Amortization expense	$ 3.3	$ 2.4	$ 6.8	$ 4.9
Future amortization expense in year 2011			13.2
Future amortization expense in year 2012			12.1
Future amortization expense in year 2013			11.5
Future amortization expense in year 2014			10.6
Future amortization expense in year 2015			9.7
Future amortization expense thereafter			$ 16.9