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Goodwill and Purchased Intangible Assets, Estimated Future Amortization Expense Intangible Assets (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
Remainder of 2013 $ 9.1  
2014 36.2  
2015 32.6  
2016 18.5  
2017 10.5  
Thereafter 9.0  
Finite-lived intangible assets, net $ 115.9 $ 111.5