Accumulated Other Comprehensive Loss (Details 1) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	$ 284.6	$ 274.0	$ 848.6	$ 795.2
Provision for tax	(78.5)	(74.3)	(222.3)	(217.1)
After tax	206.1	199.7	626.3	578.1
Reclassification out of Accumulated Other Comprehensive Loss [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
After tax	4.0	17.1	28.3	45.9
Pension and other postretirement benefit plan adjustments [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of prior service credit	(4.4)	(3.3)	(13.1)	(9.9)
Amortization of net actuarial loss	30.8	25.8	92.7	77.2
Pension and other postretirement benefit plan adjustments [Member] | Reclassification out of Accumulated Other Comprehensive Loss [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	26.4	22.5	79.6	67.3
Provision for tax	(9.0)	(7.9)	(27.4)	(23.6)
After tax	17.4	14.6	52.2	43.7
Net unrealized gains (losses) on cash flow hedges [Member] | Reclassification out of Accumulated Other Comprehensive Loss [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	(14.1)	2.6	(24.1)	1.2
Provision for tax	0.7	(0.1)	0.2	1.0
After tax	(13.4)	2.5	(23.9)	2.2
Foreign Exchange Forward [Member] | Sales [Member] | Net unrealized gains (losses) on cash flow hedges [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amounts reclassified from accumulated other comprehensive loss, net of tax	2.0	0.6	5.6	1.6
Foreign Exchange Forward [Member] | Cost of sales [Member] | Net unrealized gains (losses) on cash flow hedges [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amounts reclassified from accumulated other comprehensive loss, net of tax	$ (16.1)	$ 2.0	$ (29.7)	$ (0.4)