CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2022
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 186.5	$ 56.4	$ (49.1)
Other comprehensive income (loss), net of tax:
Net gain (loss) on derivative instruments, net of tax of $(0.3), $3.9 and $0.5, respectively	1.1	(12.5)	(1.4)
Pension and postretirement benefits, net of tax of $(16.0), $(11.8) and $(8.4), respectively	51.2	37.4	26.2
Foreign currency translation	(3.2)	5.6	(6.0)
Other comprehensive income, net of tax	49.1	30.5	18.8
Comprehensive income (loss), net of tax	$ 235.6	$ 86.9	$ (30.3)