Shareowners' Equity (Details 1) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Accumulated other comprehensive (loss) income, net of tax	$ (1,334.6)	$ (948.0)	$ (817.7)	$ (1,225.3)
Other comprehensive income (loss) before reclassifications, net of tax	(420.5)	(191.0)	324.4
Amounts reclassified from accumulated other comprehensive loss, net of tax	33.9	60.7	83.2
Other comprehensive income (loss), net of tax	(386.6)	(130.3)	407.6
Pension and other postretirement benefit plan adjustments [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Accumulated other comprehensive (loss) income, net of tax	(1,097.1)	(909.4)	(823.8)	(1,226.0)
Other comprehensive income (loss) before reclassifications, net of tax	(257.3)	(143.9)	314.9
Amounts reclassified from accumulated other comprehensive loss, net of tax	69.6	58.3	87.3
Other comprehensive income (loss), net of tax	(187.7)	(85.6)	402.2
Accumulated currency translation adjustments, net of tax [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Accumulated other comprehensive (loss) income, net of tax	(252.4)	(52.5)	8.8	0.5
Other comprehensive income (loss) before reclassifications, net of tax	(199.9)	(61.3)	8.3
Amounts reclassified from accumulated other comprehensive loss, net of tax	0.0	0.0	0.0
Other comprehensive income (loss), net of tax	(199.9)	(61.3)	8.3
Net unrealized gains (losses) on cash flow hedges, net of tax [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Accumulated other comprehensive (loss) income, net of tax	14.9	13.9	(2.7)	$ 0.2
Other comprehensive income (loss) before reclassifications, net of tax	36.7	14.2	1.2
Amounts reclassified from accumulated other comprehensive loss, net of tax	(35.7)	2.4	(4.1)
Other comprehensive income (loss), net of tax	$ 1.0	$ 16.6	$ (2.9)