CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 20.7	$ (23.9)	$ 21.5	$ (3.6)
Other comprehensive income (loss), net of tax
Pension and postretirement benefits, net of tax of $(3.5), $(2.2), $(17.4) and $(6.8), respectively	5.7	3.8	28.8	11.2
Net gain (loss) on derivative instruments, net of tax of $(4.3), $(3.4), $(13.2) and $3.3, respectively	7.2	5.7	21.8	(5.5)
Foreign currency translation	2.6	7.7	(2.1)	2.1
Other comprehensive income	15.5	17.2	48.5	7.8
Comprehensive income (loss)	$ 36.2	$ (6.7)	$ 70.0	$ 4.2