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Guarantees and Indemnifications (Tables)
3 Months Ended
Mar. 31, 2012
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 $ 22.8 April 2012 - April 2013 (1)
         
Various Letters of Credit  $ 19.9 June 2012 - December 2012
         
NUSCO and RRR Lease Payments for Vehicles and Real Estate  $ 22.1 2019 and 2024
         
NU Enterprises Surety Bonds, Insurance Bonds and Performance Guarantees $ 121.4 (2) (2)