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Guarantees and Indemnifications (Tables)
9 Months Ended
Sep. 30, 2011
Notes To Consolidated Financial Statements [Abstract] 
Schedule Of Guarantee Obligations Text Block
    Maximum   
    Exposure   
Subsidiary Description (in millions) Expiration Dates
         
Various Surety Bonds and Performance Guarantees $ 16.8 2011-2012 (1)
         
Various Letters of Credit  $ 18.9 October 2011 -
       October 2012
         
NUSCO and RRR Lease Payments for Vehicles and Real Estate  $ 23.5 2019 and 2024
         
NU Enterprises Surety Bonds, Insurance Bonds and Performance Guarantees $ 131.5 (2) (2)