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Supplemental Financial Statement Information - Cash and Cash Equivalents (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Cash and Cash Equivalents [Abstract]        
Cash $ 1,025.2 $ 222.8    
Other short-term investments 1.6 81.8    
Total cash and cash equivalents $ 1,026.8 $ 304.6 $ 380.6 $ 432.3