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Fair Value of Financial Instruments (Tables)
3 Months Ended
Mar. 31, 2016
Summary of Carrying Values Estimated Fair Values of Notes and Facility Financing Obligation

The following is a summary of the carrying values and estimated fair values of the 2018 notes, the facility financing obligation (i.e., the 2019 notes and Tranche B notes), and the Sanofi Loan Facility (in millions):

 

     March 31, 2016      December 31, 2015  
     Carrying
value
     Estimated
fair value
     Carrying
value
     Estimated
fair value
 

2018 notes

   $ 27.6       $ 21.8       $ 27.6       $ 21.3   

Facility financing obligation

   $ 75.0       $ 79.4       $ 74.6       $ 78.4   

Sanofi Loan Facility

   $ 63.5       $ 48.2       $ 44.5       $ 36.5