CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2021
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 56.4	$ (49.1)	$ (229.6)
Other comprehensive income (loss), net of tax
Pension and postretirement benefits, net of tax of $(11.8), $(8.4) and $(55.3), respectively	37.4	26.2	175.2
Net (loss) gain on derivative instruments, net of tax of $3.9, $0.5 and $(5.7), respectively	(12.5)	(1.4)	18.0
Foreign currency translation	5.6	(6.0)	12.5
Other comprehensive income, net of tax	30.5	18.8	205.7
Comprehensive income (loss), net of tax	$ 86.9	$ (30.3)	$ (23.9)