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Derivative Instruments and Hedging Activities - Schedule of Derivative Assets, Liabilities and the Effects of Offsetting (Details) - USD ($) $ in Millions | Sep. 30, 2015 | Sep. 30, 2014
--- | --- | ---
Derivatives, Fair Value |  |
Derivative financial assets | $ 58.5 | $ 45.4
Derivative asset offset amount, net | (18.9) | (18.4)
Total derivative assets - net | 39.6 | 27.0
Derivative financial liabilities | (179.9) | (75.2)
Gross amounts offset in the balance sheet | 18.9 | 18.4
Cash collateral pledged | 8.0 | 0.0
Total derivative liabilities - net | (153.0) | (56.8)
Designated as Hedging Instruments |  |
Derivatives, Fair Value |  |
Derivative financial assets | 29.5 | 17.8
Derivative financial liabilities | (10.9) | (26.4)
Designated as Hedging Instruments | Commodity Contracts |  |
Derivatives, Fair Value |  |
Derivative financial assets | 0.0 | 2.8
Derivative financial liabilities | 0.0 | (5.3)
Designated as Hedging Instruments | Foreign Currency Contracts |  |
Derivatives, Fair Value |  |
Derivative financial assets | 29.1 | 12.8
Derivative financial liabilities | (0.1) | (0.1)
Designated as Hedging Instruments | Interest Rate Contracts |  |
Derivatives, Fair Value |  |
Derivative financial assets | 0.0 | 0.1
Derivative financial liabilities | (10.8) | (21.0)
Designated as Hedging Instruments | Cross Currency Contracts |  |
Derivatives, Fair Value |  |
Derivative financial assets | 0.4 | 2.1
Derivative financial liabilities | 0.0 | 0.0
Derivatives Subject To PGC and DS Mechanisms [Member] | Commodity Contracts |  |
Derivatives, Fair Value |  |
Derivative financial assets | 1.3 | 1.7
Derivative financial liabilities | (5.6) | (2.2)
Not Designated as Hedging Instruments | Commodity Contracts |  |
Derivatives, Fair Value |  |
Derivative financial assets | 27.7 | 25.9
Derivative financial liabilities | $ (163.4) | $ (46.6)

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