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Investment in TRIP Holdings (Tables)
6 Months Ended
Jun. 30, 2011
Equity Investment (Tables) [Abstract]  
Companies carrying value of its investment in TRIP
                 
    June 30,     December 31,  
    2011     2010  
    (in millions)  
Capital contributions
  $ 47.3     $ 47.3  
Equity purchased from investors
    44.8       44.8  
 
           
 
    92.1       92.1  
Equity in earnings
    11.5       7.5  
Equity in unrealized gains (losses) on derivative financial instruments
    (0.8 )     (1.4 )
Distributions
    (7.0 )     (7.0 )
Deferred broker fees
    (0.7 )     (0.8 )
 
           
 
  $ 95.1     $ 90.4