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Fair Value Measurements - Schedule of Carrying Amounts and Estimated Fair Values of Financial Instruments not Recorded at Fair Value in the Financial Statements (Details) - Level 2 - USD ($) $ in Millions | Sep. 30, 2025 | Jun. 30, 2025
--- | --- | ---
Carrying Value |  |
Carrying amounts and estimated fair values of financial instruments not recorded at fair value |  |
Long-term debt | $ 695.7 | $ 695.4
Company-owned life insurance | 35.3 | 33.1
Fair Value |  |
Carrying amounts and estimated fair values of financial instruments not recorded at fair value |  |
Long-term debt | 709.9 | 712.4
Company-owned life insurance | $ 35.3 | $ 33.1

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