text: **Derivative Instruments**
  At December 31, 2013, all of our US dollar-denominated long-term 
  debt instruments were hedged against fluctuations in foreign exchange 
  rates for accounting purposes (2012 – 91.7%). 
  *Debt Derivatives*
  We use cross currency interest exchange agreements to hedge the 
  foreign exchange risk on all of the principal and interest obligations of 
  our US dollar-denominated senior notes and debentures. We use Debt 
  Derivatives for risk-management purposes only. 
  
  related to our Debt 