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Summary of Significant Accounting Policies - Fair Value Measurement (Details) - USD ($) $ in Millions	Mar. 31, 2025	Jun. 30, 2024
Assets and liabilities measured at fair value
Estimated fair value of long-term debt	$ 1,012.8
Estimated fair value of marketable securities	226.2
Measured on a recurring basis
Assets and liabilities measured at fair value
Assets, Fair Value Disclosure	0.0	$ 0.0
Liabilities, Fair Value Disclosure	$ 0.0	$ 0.0

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- Definition

Fair value portion of asset recognized for present right to economic benefit.

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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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Fair value of financial and nonfinancial obligations.

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