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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, 2013
Dec. 31, 2012
Deferred Revenue and Advances from Customers    
Deferred revenue $ 112.1 $ 123.1
Advances from customers 44.7 2.4
Total 156.8 125.5
Deferred costs associated with deferred revenue $ 106.2 $ 116.8