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Fair Value Measurements (Tables)
 9 Months Ended
Sep. 30, 2017
Fair Value Disclosures [Abstract]  
Carrying Value and Estimated Fair Values of Outstanding Debt

The carrying values and estimated fair values of our significant outstanding debt as of September 30, 2017 and December 31, 2016 were as follows:

 

     September 30, 2017      December 31, 2016  

(in millions of U.S. dollars)

    Carrying
Value		      Fair
Value		      Carrying
Value		      Fair
Value		  

10.000% senior notes due in 2021 1, 2

      271.1        264.4        384.2        383.7  

5.500% senior notes due in 2024 1, 3

      521.3        584.9        464.3        505.5  

5.500% senior notes due in 2025 1, 3

      738.8        781.9        —          —    
  

 

 

     

 

 

     

 

 

     

 

 

  

Total

    $ 1,531.2      $ 1,631.2      $ 848.5      $ 889.2  
  

 

 

     

 

 

     

 

 

     

 

 

  

 

1. The fair values were based on the trading levels and bid/offer prices observed by a market participant and are considered Level 2 financial instruments.
2. Includes unamortized premium of $21.1 million and $34.2 million at September 30, 2017 and December 31, 2016, respectively.
3. The carrying value of our significant outstanding debt is net of unamortized debt issuance costs of $21.0 million and $9.8 million as of September 30, 2017 and December 31, 2016, respectively.