CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2016	Mar. 31, 2015
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (23.9)	$ (1.4)	$ (3.6)	$ 36.2
Other comprehensive income (loss), net of tax
Pension and postretirement benefits, net of tax of $(2.2), $(1.8), $(6.8) and $(5.5), respectively	3.8	3.0	11.2	8.9
Net gain (loss) on derivative instruments, net of tax of $(3.4), $8.0, $3.3 and $23.4, respectively	5.7	(13.2)	(5.5)	(38.7)
Foreign currency translation	7.7	(9.9)	2.1	(27.9)
Other comprehensive income (loss)	17.2	(20.1)	7.8	(57.7)
Comprehensive (loss) income	$ (6.7)	$ (21.5)	$ 4.2	$ (21.5)