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Fair Value of Financial Instruments (Tables)
6 Months Ended
Jun. 30, 2015
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, 2015      December 31, 2014  
     Carrying
value
     Estimated
fair value
     Carrying
value
     Estimated
fair value
 

2015 notes

   $ 99.8       $ 103.2       $ 99.4       $ 102.9   

Facility financing obligation

   $ 73.8       $ 77.9       $ 73.0       $ 75.1