CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024
Statement of Comprehensive Income [Abstract]
Net income	$ 95.4	$ 6.3	$ 264.3	$ 92.9
Other comprehensive income (loss), net of tax:
Net gain (loss) on derivative instruments, net of tax of $(0.7), $(0.7), $(1.0) and $0.5, respectively	2.3	2.3	3.1	(1.4)
Pension and postretirement benefits, net of tax of $(0.3), $(8.4), $(1.0) and $(9.0), respectively	1.0	27.0	2.9	28.6
Foreign currency translation	3.4	(2.2)	(1.6)	0.5
Total other comprehensive income, net of tax	6.7	27.1	4.4	27.7
Comprehensive income, net of tax	$ 102.1	$ 33.4	$ 268.7	$ 120.6