Accumulated Other Comprehensive Loss (Details 1) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income before income taxes	$ 236.9	$ 287.5
Income tax provision	(51.4)	(73.3)
Net income	185.5	214.2
Reclassification out of Accumulated Other Comprehensive Loss [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net income	13.5	12.8
Pension and other postretirement benefit plan adjustments [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of prior service credit	(3.5)	(4.4)
Amortization of net actuarial loss	31.7	31.2
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]
Income before income taxes	28.2	26.8
Income tax provision	(9.8)	(9.2)
Net income	18.4	17.6
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]
Income before income taxes	(6.3)	(4.6)
Income tax provision	1.4	(0.2)
Net income	(4.9)	(4.8)
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	2.5	1.2
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	$ (8.8)	$ (5.8)