CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Statement of Comprehensive Income [Abstract]
Net loss	$ (7.5)	$ (40.5)	$ (51.7)	$ (172.5)
Other comprehensive income (loss), net of tax
Pension and postretirement benefits, net of tax of $(0.4), $(31.5), $(1.2) and $(33.8), respectively	1.1	98.1	3.0	105.3
Net gain on derivative instruments, net of tax of $(8.6), $(0.5), $(9.5) and $(4.7), respectively	27.2	1.7	30.0	14.9
Foreign currency translation	0.1	(3.7)	(2.7)	10.8
Other comprehensive income, net of tax	28.4	96.1	30.3	131.0
Comprehensive income (loss)	$ 20.9	$ 55.6	$ (21.4)	$ (41.5)