Consolidated Statements Of Comprehensive Income (Parenthetical) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2012	Mar. 31, 2011
Consolidated Statements Of Comprehensive Income [Abstract]
Pension and post-retirement benefits, tax	$ (1.2)	$ (2.8)	$ (3.7)	$ (8.0)
Net (loss) gain on derivative instruments, tax	3.1	(0.8)	18.3	(10.8)
Unrealized gain (loss) on marketable securities, tax	$ 0	$ 0	$ 1.0	$ 0