CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Pension and post-retirement benefits, tax	$ (2.5)	$ (1.2)	$ (7.7)	$ (3.7)
Net gain (loss) on derivative instruments, tax	(1.1)	3.1	(4.6)	18.3
Unrealized gain (loss) on marketable securities, tax	$ (0.2)	$ 0	$ (0.2)	$ 1.0