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Fair Value Measurements - Offsetting Derivative Assets and Liabilities (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014	Sep. 30, 2013	Jun. 30, 2013
Fair Value Disclosures [Abstract]
Derivative Asset, Fair Value, Gross Asset	$ 31.9	$ 26.3	$ 25.1
Derivative Asset, Offset Amount, Gross	18.2	2.1	6.4
Derivative Asset	13.7	24.2	18.7
Derivative Liability, Fair Value, Gross Liability	(61.3)	(57.5)	(87.1)
Derivative Liability, Offset Amount, Gross	18.2	2.1	6.4
Derivative Liability	$ 43.1	$ 55.4	$ 80.7

Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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- Definition

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References+ Details