CONSOLIDATED STATEMENTS OF EQUITY (Parenthetical) (USD $) In Millions, except Per Share data	12 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009
CONSOLIDATED STATEMENTS OF EQUITY
Change in fair value of derivative instruments, tax	$ 0.7	$ 1.2	$ 21.3
Losses reclassified into earnings from other comprehensive income, tax	6.0	14.9	18.6
Employee pension and postretirement benefits, tax	$ 19.8	$ 3.2	$ 19.2
Cash dividends per share (in dollars per share)			$ 0.20