CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Parenthetical) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2011
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
Pension and post-retirement benefits, tax	$ (48.3)	$ 78.5	$ (71.5)
Net (loss) gain on derivative instruments, tax	5.3	21.6	(3.1)
Unrealized gain (loss) on marketable securities, tax	$ (0.2)	$ 0.1	$ (0.1)