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Deferred Revenue and Advances from Customers (Deferred Revenue and Advances From Customers) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Deferred Revenue and Advances from Customers    
Deferred revenue $ 146.8 $ 181.5
Advances from customers 22.3 23.7
Total 169.1 205.2
Deferred costs associated with deferred revenue $ 139.7 $ 175.5