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Debt
 9 Months Ended
Mar. 31, 2025
Debt Disclosure [Abstract]  
Debt Debt
The Company issued four series of fixed-rate notes with staggered maturities of 7 and 10 years totaling $4.0 billion (collectively the “Notes”). The Notes are senior unsecured obligations, and interest is payable in arrears, semi-annually.
During the first quarter ended September 30, 2024, the Company issued $1.0 billion of senior notes due in 2034 bearing a fixed interest rate of 4.450%. In connection with the senior notes issuance, the Company terminated several derivative contracts in place to hedge exposure in changes in benchmark interest rates for the senior notes issued with an aggregate notional amount totaling $1.0 billion (of which $400.0 million were executed during the first quarter ended September 30, 2024 and $600.0 million were executed on the day of issuance). Since these derivative contracts were classified as cash flow hedges, the unamortized loss of $12.5 million was deferred in accumulated other comprehensive income and will be amortized to earnings over the life of the issued Notes as the interest payments are made.
The principal amounts and associated effective interest rates of the Notes and other debt as of March 31, 2025 and June 30, 2024, are as follows:
Debt instrumentEffective Interest RateMarch 31, 2025June 30, 2024
Fixed-rate 3.375% notes due September 15, 2025
3.47%$1,000.0 $1,000.0 
Fixed-rate 1.700% notes due May 15, 2028
1.85%1,000.0 1,000.0 
Fixed-rate 1.250% notes due September 1, 2030
1.83%1,000.0 1,000.0 
Fixed-rate 4.450% notes due September 9, 2034
4.75%1,000.0 — 
Other3.2 4.1 
4,003.2 3,004.1 
Less: current portion(1,000.7)(1.1)
Less: unamortized discount and debt issuance costs(20.0)(11.7)
Total long-term debt$2,982.5 $2,991.3 
The effective interest rates for the Notes include the interest on the Notes and amortization of the discount and debt issuance costs.

As of March 31, 2025, the fair value of the Notes, based on Level 2 inputs, was $3,739.8 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” in the Company's Annual Report on Form 10-K for fiscal 2024.

In anticipation of the refinancing of our fixed-rate 3.375% notes due September 15, 2025, the Company entered into a series of treasury rate lock transactions from January 16, 2025 through April 24, 2025, with an aggregate notional amount totaling $400.0 million, of which $300.0 million were entered into during the third quarter ended March 31, 2025, $50.0 million entered into on April 2, 2025 and $50.0 million entered into on April 24, 2025, to hedge its exposure to changes in interest rates through the completion of the refinancing. The derivative contracts entered into during the fiscal year ended June 30, 2025 have been designated as cash-flow hedges and will be terminated upon completion of the refinancing. Changes in the derivatives’ 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 16 for the impact to accumulated other comprehensive income. There are no cash flows associated with the derivatives until settlement occurs with the counter-parties. The treasury rate lock derivatives are classified as Level 2 in the fair value hierarchy as their value is determined using observable inputs such as forward treasury rates.