CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2023
Statement of Comprehensive Income [Abstract]
Net income	$ 376.0	$ 186.5	$ 56.4
Other comprehensive income, net of tax:
Net gain (loss) on derivative instruments, net of tax of $(0.5), $(0.3) and $3.9, respectively	1.7	1.1	(12.5)
Pension and postretirement benefits, net of tax of $(5.3), $(16.0) and $(11.8), respectively	16.9	51.2	37.4
Foreign currency translation	7.4	(3.2)	5.6
Total other comprehensive income, net of tax	26.0	49.1	30.5
Comprehensive income, net of tax	$ 402.0	$ 235.6	$ 86.9