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Fair Value Of Financial Instruments (Detail) (Fair Value, Inputs, Level 2, Fixed-Rate Debt, USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Fair Value, Inputs, Level 2 | Fixed-Rate Debt
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt outstanding carrying value $ 43.8 $ 45.8
Debt outstanding fair value $ 50.1 $ 40.9