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, 2023	Jun. 30, 2023
Carrying Value
Carrying amounts and estimated fair values of financial instruments not recorded at fair value
Long-term debt	$ 693.3	$ 693.0
Company-owned life insurance	24.9	26.2
Fair Value
Carrying amounts and estimated fair values of financial instruments not recorded at fair value
Long-term debt	689.4	698.1
Company-owned life insurance	$ 24.9	$ 26.2