Consolidated Statement of Comprehensive Income (Loss) (USD $) In Millions	12 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009
Consolidated Statement of Comprehensive Income (Loss) [Abstract]
Net income	$ 697.8	$ 464.3	$ 220.7
Other comprehensive loss:
Unrecognized pension and postretirement benefit plan liabilities (net of tax benefit of $93.2, $71.8 and $193.8)	(178.7)	(126.6)	(360.3)
Currency translation adjustments	23.4	4.4	(53.2)
Net change in unrealized gains and losses on cash flow hedges (net of tax expense of $2.3, $5.0 and $3.1)	3.9	8.3	4.8
Net change in unrealized gains and losses on investment securities, net of tax	(0.3)	0.2	0.2
Other comprehensive loss	(151.7)	(113.7)	(408.5)
Comprehensive income (loss)	$ 546.1	$ 350.6	$ (187.8)