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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