Financial Instruments and Risk Management (Schedule of Derivative Instruments Designated as Cash Flow Hedges) (Details) - Designated as hedge - Cash flow hedge - FX Contract - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2016	Mar. 31, 2015	Sep. 30, 2015
Derivative [Line Items]
Estimated fair value of derivative	[1],[2]	$ (4.5)		$ (4.5)		$ 4.6
Gain recognized in OCI	[3]	(5.3)	$ 14.8	(4.5)	$ 26.9
Other income, net
Derivative [Line Items]
Gain reclassified from OCI into income	[4],[5]	$ 1.0	$ 8.9	$ 4.6	$ 14.5

[1] All derivative assets are presented in Other current assets or Other assets.

[2] All derivative liabilities are presented in Other current liabilities or Other liabilities.

[3] OCI is defined as Other comprehensive loss.

[4] Each of these derivative instruments had a high correlation to the underlying exposure being hedged for the periods indicated and had been deemed highly effective in offsetting associated risk.

[5] Gain reclassified to income was recorded in Other income, net.