CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Pension and post-retirement benefits, tax	$ (2.0)	$ (2.6)	$ (4.3)	$ (5.2)
Net gain (loss) on derivative instruments, tax	(1.4)	8.1	(3.6)	(3.5)
Unrealized gain on marketable securities, tax	$ 0	$ 0	$ 0	$ 0