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Fair Value of Financial Instruments (Tables)
6 Months Ended
Jun. 30, 2014
Summary of Carrying Values and Estimated Fair Values of Notes and Facility Financing Obligation

The following is a summary of the carrying values and estimated fair values of the 2015 notes and the facility financing obligation (i.e., the 2019 notes and Tranche B notes) (in millions):

 

     June 30, 2014      December 31, 2013  
     Carrying
value
     Estimated
fair value
     Carrying
value
     Estimated
fair value
 

2015 notes

   $ 98.9       $ 161.2       $ 98.4       $ 102.2   

Facility financing obligation

   $ 37.7       $ 38.0       $ 102.3       $ 107.0