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Deferred Revenue and Advances from Customers (Deferred Revenue and Advances From Customers) (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Deferred Revenue and Advances from Customers    
Deferred revenue $ 105.0 $ 181.5
Advances from customers 65.4 23.7
Total 170.4 205.2
Deferred costs associated with deferred revenue $ 92.6 $ 175.5