CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020
Statement of Comprehensive Income [Abstract]
Net loss	$ (29.4)	$ (84.9)	$ (44.1)	$ (132.0)
Other comprehensive income (loss), net of tax
Pension and postretirement benefits, net of tax of $(0.4), $(1.1), $(0.8) and $(2.2), respectively	0.8	3.6	1.9	7.2
Net gain on derivative instruments, net of tax of $(0.5), $(1.6), $(0.9) and $(4.3), respectively	1.7	4.9	2.8	13.2
Foreign currency translation	(0.7)	8.8	(2.8)	14.5
Other comprehensive income, net of tax	1.8	17.3	1.9	34.9
Comprehensive loss	$ (27.6)	$ (67.6)	$ (42.2)	$ (97.1)