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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
Dec. 31, 2024
Jun. 30, 2024
Carrying Value    
Carrying amounts and estimated fair values of financial instruments not recorded at fair value    
Long-term debt $ 694.8 $ 694.2
Company-owned life insurance 34.5 31.8
Fair Value    
Carrying amounts and estimated fair values of financial instruments not recorded at fair value    
Long-term debt 707.6 709.1
Company-owned life insurance $ 34.5 $ 31.8