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Goodwill and Intangible Assets (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Dec. 31, 2010
Jul. 31, 2010
Finite-Lived Intangible Assets [Line Items]      
Aggregate amortization expense$ 5.2$ 8.4$ 17.6$ 10.7  
Business Acquisition, Cost of Acquired Entity, Purchase Price     650
Business Acquisition, Purchase Price Allocation, Goodwill Amount     314.7
Business Acquisition, Purchase Price Allocation, Intangible Assets Not Amortizable     150.0
Business Acquisition, Purchase Price Allocation, Amortizable Intangible Assets     172.8
Business Acquisition Fair Value Of Contingent Consideration4.2 4.2 11.026.0
Business Acquisition Contingent Consideration At Fair Value Minimum0 0   
Business Acquisition Contingent Consideration Fair Value Maximum$ 15 $ 15   
Excess Of Fair Value Over Carrying Value At Interim Testing Date Goodwill And Indefinite Lived Intangibles13.00% 13.00%