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Deferred Revenue and Advances from Customers (Deferred Revenue and Advances From Customers) (Details) (USD $)
In Millions
Jun. 30, 2011
Dec. 31, 2010
Deferred Revenue and Advances from Customers    
Deferred revenue $ 158.5 $ 176.1
Advances from customers 30.0 3.0
Total 188.5 179.1
Deferred costs associated with deferred revenue $ 152.5 $ 152.9