CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2013
Statement of Comprehensive Income [Abstract]
Pension and post-retirement benefits, tax	$ 12.0	$ (22.1)	$ (48.3)
Net gain (loss) on derivative instruments, tax	21.7	(29.5)	5.3
Unrealized gain (loss) on marketable securities, tax	$ 0.0	$ 0.0	$ (0.2)