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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
Dec. 31, 2010
Jul. 31, 2010
Finite-Lived Intangible Assets [Line Items]            
Aggregate amortization expense $ 6.2 $ 1.5 $ 12.4 $ 2.3    
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 Consideration 4.2   4.2   11.0 26.0
Business Acquisition Contingent Consideration At Fair Value Minimum 0   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 Intangibles 13.00%   13.00%