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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, 2013
Dec. 31, 2012
Deferred Revenue and Credits, Current [Abstract]    
Deferred revenue $ 163.7 $ 123.1
Advances from customers 0 2.4
Total 163.7 125.5
Deferred costs associated with deferred revenue $ 136.6 $ 116.8