CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME (Parenthetical) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2010
CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME
Pension and post-retirement benefits, tax	$ 75.8	$ (71.5)	$ 23.5
Net (loss) gain on derivative instruments, tax	21.6	(3.1)	(9.2)
Unrealized gain (loss) on marketable securities, tax	$ 0.1	$ (0.1)	$ 0.3