Accumulated Other Comprehensive (Loss)/Income - Reclassifications out of AOCI (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Dec. 31, 2013		Dec. 31, 2012
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other financing items, net	$ (2.0)		$ 7.9
Total before tax	151.8		188.7
Income Tax Expense (Benefit)	(43.9)		(58.9)
Net earnings	107.9		129.8
Cost of products sold	602.1		630.9
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net earnings	4.3	[1]
Gains and losses on cash flow hedges [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other financing items, net	2.3	[1]
Total before tax	2.3	[1]
Income Tax Expense (Benefit)	(1.1)	[1]
Net earnings	1.2	[1]
Amortization of defined benefit pension/postretirement items [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	4.8	[1]
Income Tax Expense (Benefit)	(1.7)	[1]
Net earnings	3.1	[1]
Actuarial losses [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Cost of products sold	4.7	[1],[2]
Curtailment gain [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Cost of products sold	$ 0.1	[1],[2]

[1] Amounts in parentheses indicate debits to profit/loss.

[2] These AOCI components are included in the computation of net periodic benefit cost (see Note 7 for further details).