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Deferred Revenue and Advances from Customers (Deferred Revenue and Advances From Customers) (Details) (USD $)
In Millions
Sep. 30, 2011
Dec. 31, 2010
Deferred Revenue and Advances from Customers  
Deferred revenue$ 166.1$ 176.1
Advances from customers26.03.0
Total192.1179.1
Deferred costs associated with deferred revenue$ 159.8$ 152.9