NOTE 9. DEBT The Company has fixed-rate notes with 5-year and 10-year maturities for an aggregate principal amount of $2.0 billion (collectively the “Notes”). The Notes are senior unsecured obligations, and interest is payable in arrears, semi-annually. The principal amounts and associated effective interest rates of the Notes and other debt as of June 30, 2020 and 2019 are as follows: In anticipation of the refinancing of our fixed-rate 2.25% notes due September 15, 2020, from December 3, 2019 through March 4, 2020, the Company entered into a series of treasury rate lock transactions, with an aggregate notional amount totaling $400.0 million, to hedge its exposure to changes in interest rates through the completion of the refinancing. The derivative contracts entered into during fiscal 2020 have been designated as cash-flow hedges and will be terminated upon completion of the refinancing. Changes in the derivative’s fair value are recorded each period in other comprehensive income with a corresponding current asset or liability and, upon settlement, the aggregate amount in accumulated other comprehensive income will be amortized into net income over the term of the future debt instrument. Refer to Note 13 for the impact to accumulated other comprehensive income. There are no cash flows associated with the derivative until settlement occurs with the counter-parties. On July 15, 2020, the Company gave notice to the current holders of our intention to redeem the $1.0 billion 2.25% Senior Notes due September 15, 2020 on the call date of August 15, 2020. It is the Company's intent to issue new long-term notes to fund this redemption and which also may be used for general corporate purposes. If necessary in the interim, the Company intends to issue commercial paper to fund the Notes’ redemption until such time as the new Notes are issued. NOTE 10. EMPLOYEE BENEFIT PLANS A. Stock-based Compensation Plans. Stock-based compensation consists of the following: • Stock Options. Stock options are granted to employees at exercise prices equal to the fair market value of the Company's common stock on the dates of grant. Stock options generally vest ratably over 4 years and have a term of 10 years. Compensation expense is measured based on the fair value of the stock option on the grant date and recognized on a straight-line basis over the vesting period. Stock options are forfeited if the employee ceases to be employed by the Company prior to vesting. The  Company determines the fair value of stock options issued using a binomial option-pricing model. The binomial option-pricing model considers a range of assumptions related to volatility, dividend yield, risk-free interest rate, and employee exercise behavior. Expected volatilities utilized in the binomial option-pricing model are based on a combination of implied market volatilities, historical volatility of the Company's stock price, and other factors. Similarly, the dividend yield is based on historical experience and expected future changes. The risk-free rate is derived from the U.S. Treasury yield curve in effect at the time of grant. The binomial option-pricing model also incorporates exercise and forfeiture assumptions based on an analysis of historical data. The expected life of a stock option grant is derived from the output of the binomial model and represents the period of time that options granted are expected to be outstanding. Debt instrument Effective Interest Rate June 30, 2020 June 30, 2019 Fixed-rate 2.250% notes due September 15, 2020 2.37% $ 1,000.0  $ 1,000.0  Fixed-rate 3.375% notes due September 15, 2025 3.47% 1,000.0  1,000.0  Other 8.4  10.9  2,008.4  2,010.9  Less: current portion (1,001.8) (2.5) Less: unamortized discount and debt issuance costs (3.8) (6.2) Total long-term debt $ 1,002.8  $ 2,002.2  The effective interest rates for the Notes include the interest on the Notes and amortization of the discount and debt issuance costs. As of June 30, 2020, the fair value of the Notes, based on Level 2 inputs, was $2,124.7 million. For a description of the fair value hierarchy and the Company's fair value methodologies, including the use of an independent third-party pricing service, see Note 1 “Summary of Significant Accounting Policies.”