Shareowners' Equity (Details 1) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	$ (948.0)				$ (817.7)				$ (948.0)	$ (817.7)	$ (1,225.3)	$ (992.9)
Other comprehensive income (loss) before reclassifications									191.0	(324.4)	282.7
Amounts reclassified from accumulated other comprehensive loss									60.7	83.2	50.3
Other comprehensive income (loss)									(130.3)	407.6	(232.4)
Provision for tax									(307.4)	(224.6)	(228.9)
After tax	248.7	199.7	180.3	198.1	215.3	203.7	175.9	161.4	826.8	756.3	737.0
Sales									5,933.1	5,706.0	5,656.1
Cost of sales									(3,391.3)	(3,326.4)	(3,315.9)
Pension and other postretirement benefit plan adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	(909.4)				(823.8)				(909.4)	(823.8)	(1,226.0)	(1,033.6)
Other comprehensive income (loss) before reclassifications									143.9	(314.9)	246.7
Amounts reclassified from accumulated other comprehensive loss									58.3	87.3	54.3
Other comprehensive income (loss)									(85.6)	402.2	(192.4)
Accumulated currency translation adjustments, net of tax [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	(52.5)				8.8				(52.5)	8.8	0.5	35.5
Other comprehensive income (loss) before reclassifications									61.3	(8.3)	35.0
Amounts reclassified from accumulated other comprehensive loss									0	0	0
Other comprehensive income (loss)									(61.3)	8.3	(35.0)
Net unrealized gains (losses) on cash flow hedges, net of tax [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	13.9				(2.7)				13.9	(2.7)	0.2	5.2
Other comprehensive income (loss) before reclassifications									(14.2)	(1.2)	1.0
Amounts reclassified from accumulated other comprehensive loss									2.4	(4.1)	(4.0)
Other comprehensive income (loss)									16.6	(2.9)	(5.0)
Reclassification out of Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
After tax									60.7	83.2	50.3
Reclassification out of Accumulated Other Comprehensive Income (Loss) [Member] | Pension and other postretirement benefit plan adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amortization of prior service credit									(12.9)	(13.2)	(12.9)
Amortization of net actuarial loss									102.6	149.0	97.1
Total before tax									89.7	135.8	84.2
Provision for tax									(31.4)	(48.5)	(29.9)
After tax									58.3	87.3	54.3
Reclassification out of Accumulated Other Comprehensive Income (Loss) [Member] | Net unrealized gains (losses) on cash flow hedges, net of tax [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total before tax									1.6	(6.5)	(6.4)
Provision for tax									0.8	2.4	2.4
After tax									2.4	(4.1)	(4.0)
Sales									2.3	(1.6)	1.1
Cost of sales									$ (0.7)	$ (4.9)	$ (7.5)