CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Parenthetical) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2012
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
Pension and post-retirement benefits, tax	$ (22.1)	$ (48.3)	$ 78.5
Net gain (loss) on derivative instruments, tax	(29.5)	5.3	21.6
Unrealized gain (loss) on marketable securities, tax	$ 0	$ (0.2)	$ 0.1