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	Mar. 31, 2024	Jun. 30, 2023
Carrying Value
Carrying amounts and estimated fair values of financial instruments not recorded at fair value
Long-term debt	$ 693.9	$ 693.0
Company-owned life insurance	30.2	26.2
Fair Value
Carrying amounts and estimated fair values of financial instruments not recorded at fair value
Long-term debt	708.9	698.1
Company-owned life insurance	$ 30.2	$ 26.2