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Liability Measured at Fair Value on Recurring Basis (Detail) (Fair Value, Measurements, Recurring, USD $)
In Millions, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Asset:    
Cash equivalents $ 37.1 $ 39.0
Liability:    
Warrant derivative liability 91.0 123.1
Fair Value, Inputs, Level 1
   
Asset:    
Cash equivalents 37.1 39.0
Fair Value, Inputs, Level 3
   
Liability:    
Warrant derivative liability $ 91.0 $ 123.1