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Derivative Instruments and Hedging Activities - Fair Value of Derivative Assets and Liabilities (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Sep. 30, 2019 | Mar. 31, 2019
--- | --- | --- | ---
Derivative assets: |  |  |
Total derivative assets — gross | $ 106.3 | $ 101.1 | $ 90.8
Gross amounts offset in the balance sheet | (25.7) | (29.0) | (35.8)
Total derivative assets — net | 80.6 | 72.1 | 55.0
Derivative liabilities: |  |  |
Total derivative liabilities — gross | (374.7) | (191.6) | (83.3)
Gross amounts offset in the balance sheet | 25.7 | 29.0 | 35.8
Cash collateral pledged | 58.0 | 29.3 | 0.0
Total derivative liabilities — net | (291.0) | (133.3) | (47.5)
Derivatives subject to PGC and DS mechanisms: |  |  |
Derivative assets: |  |  |
Total derivative assets — gross | 1.4 | 1.4 | 1.3
Derivative liabilities: |  |  |
Total derivative liabilities — gross | (1.9) | (3.7) | (0.2)
Derivatives designated as hedging instruments: | Foreign currency contracts |  |  |
Derivative assets: |  |  |
Total derivative assets — gross | 27.2 | 17.4 | 7.1
Derivatives designated as hedging instruments: | Interest rate contracts |  |  |
Derivative liabilities: |  |  |
Total derivative liabilities — gross | (54.1) | (12.3) | (5.7)
Derivatives not designated as hedging instruments: |  |  |
Derivative assets: |  |  |
Total derivative assets — gross | 77.7 | 82.3 | 82.4
Derivative liabilities: |  |  |
Total derivative liabilities — gross | (318.7) | (175.6) | (77.4)
Derivatives not designated as hedging instruments: | Foreign currency contracts |  |  |
Derivative assets: |  |  |
Total derivative assets — gross | 30.8 | 41.6 | 22.7
Derivative liabilities: |  |  |
Total derivative liabilities — gross | (6.8) | (4.3) | (4.9)
Derivatives not designated as hedging instruments: | Commodity contracts |  |  |
Derivative assets: |  |  |
Total derivative assets — gross | 46.9 | 40.7 | 59.7
Derivative liabilities: |  |  |
Total derivative liabilities — gross | $ (311.9) | $ (171.3) | $ (72.5)

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