CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 23.4	$ (6.2)
Other comprehensive income, net of tax
Pension and postretirement benefits, net of tax of $(1.3) and $(10.5), respectively	2.1	17.4
Net gain on derivative instruments, net of tax of $(4.9) and $(6.5), respectively	8.1	10.8
Foreign currency translation	1.8	(0.7)
Other comprehensive income	12.0	27.5
Comprehensive income	$ 35.4	$ 21.3