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Other Income (Expense), Net (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Other Nonoperating Income (Expense) [Abstract]      
Gain on sale of non-current investments $ 0 $ 23.5 $ 11.1
Other (2.7) (5.4) (3.2)
Other income/(expense), net (2.7) 18.1 7.9
Vertex
     
Investment Holdings [Line Items]      
Investments disposed (in shares)   1.8  
Cash consideration received from disposal of investments   94.7  
Gain realized on disposal of available-for-sale investment   $ 23.5 $ 11.1