Table of Contents We have performed a sensitivity analysis to estimate our exposure to market risk of foreign exchange rates and commodity prices reflecting the impact of a hypothetical 10% adverse change in the applicable market. The volatility of the applicable rates and prices is dependent on many factors which cannot be forecasted with reliable accuracy. Losses or gains from the revaluation or settlement of the related underlying positions would substantially offset such gains or losses on the derivative instruments. The aggregate notional value, estimated fair value and sensitivity analysis for our open foreign currency and commodity derivative instruments are summarized as follows: The estimated fair value of our fixed interest rate debt is subject to interest rate risk, credit risk and foreign currency risk. In addition, we also have variable interest rate debt outstanding (primarily LIBOR-based), certain of which includes a fixed margin subject to the same risks identified for our fixed interest rate debt. As of February 28, 2019, and February 28, 2018, we had no interest rate swap contracts outstanding. We have performed a sensitivity analysis to estimate our exposure to market risk of interest rates reflecting the impact of a hypothetical 1% increase in the prevailing interest rates. The volatility of the applicable rates is dependent on many factors which cannot be forecasted with reliable accuracy. The aggregate notional value, estimated fair value and sensitivity analysis for our outstanding fixed and variable interest rate debt, including current maturities, are summarized as follows: The estimated fair value of our investments in the Canopy warrants and the Canopy convertible debt securities are subject to equity price risk, interest rate risk, credit risk and foreign currency risk. These investments are recognized at fair value utilizing various option-pricing models and have the potential to fluctuate from, among other items, changes in the quoted market price of the underlying equity security. We manage our equity price risk exposure by closely monitoring the financial condition, performance and outlook of Canopy Growth Corporation. As of February 28, 2019, the fair value of our investments in the Canopy warrants and the Canopy convertible debt securities was $3,234.7 million, with an unrealized net gain on these investments of $1,678.7 million recognized in our results of operations for the year ended February 28, 2019. We have performed a sensitivity analysis to estimate our exposure to market risk of the equity price reflecting the impact of a hypothetical 10% adverse change in the quoted market price of the underlying equity security. As of February 28, 2019, such a hypothetical 10% adverse change would have resulted in a decrease in fair value of $438.3 million. For additional discussion on our market risk, refer to Notes 6 and 7 of the Notes to the Financial Statements. Interest Rate Risk Equity Price Risk 50 Aggregate Notional Value Fair Value Decrease in Fair Value –  Hypothetical  1% Rate Increase February 28,  2019 February 28,  2018 February 28,  2019 February 28,  2018 February 28,  2019 February 28,  2018 (in millions) Fixed interest rate debt $ 10,278.9 $ 8,787.5 $ 10,098.5 $ 8,682.9 $ (591.0 ) $ (524.3 ) Variable interest rate debt $ 3,422.7 $ 1,476.1 $ 3,461.9 $ 1,460.7 $ (88.0) $ (29.6) Aggregate Notional Value Fair Value, Net Asset (Liability) Increase (Decrease) in Fair Value – Hypothetical 10% Adverse Change February 28,  2019 February 28,  2018 February 28,  2019 February 28,  2018 February 28,  2019 February 28,  2018 (in millions) Foreign currency contracts $ 2,039.6 $ 1,906.0 $ 22.5 $ 20.4 $ (166.5 ) $ (107.1 ) Commodity derivative contracts $ 284.7 $ 177.5 $ (2.9) $ 3.5 $ 24.4 $ (15.0)