Other Comprehensive Income (Schedule of Items Reclassified out of AOCL) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended
	Mar. 31, 2015		Mar. 31, 2014		Mar. 31, 2015		Mar. 31, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amount reclassified	$ (36.6)		$ (25.3)		$ (53.6)		$ (44.7)
Tax effect	10.5		28.6		15.4		34.8
Net of tax	(26.1)		3.3		(38.2)		(9.9)
Pension and Postretirement Defined Benefit Plan Items [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amount reclassified	1.4	[1]	0.9	[1]	2.7	[1]	1.7	[1]
Tax effect	(0.5)	[1]	(0.4)	[1]	(1.0)	[1]	(0.7)	[1]
Net of tax	0.9	[1]	0.5	[1]	1.7	[1]	1.0	[1]
Available-for-Sale Securities and Currency Hedges [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amount reclassified		[2]	0.1	[2]		[2]	0.1	[2]
Tax effect		[2]		[2]		[2]		[2]
Net of tax		[2]	$ 0.1	[2]		[2]	$ 0.1	[2]

[1] Reclassified from accumulated other comprehensive loss into cost of goods sold and selling and administrative expenses. These components are included in the computation of net periodic pension expense.

[2] Reclassified from accumulated other comprehensive loss into other income (expense), net.