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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, 2019 | Sep. 30, 2018
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Derivative assets: |  |
Total derivative assets – gross | $ 101.1 | $ 232.5
Gross amounts offset in the balance sheet | (29.0) | (34.3)
Cash collateral received | 0.0 | (12.2)
Total derivative assets – net | 72.1 | 186.0
Derivative liabilities: |  |
Total derivative liabilities – gross | (191.6) | (58.8)
Gross amounts offset in the balance sheet | 29.0 | 34.3
Cash collateral pledged | 29.3 | 0.0
Total derivative liabilities – net | (133.3) | (24.5)
Commodity contract - subject to PGC and DS mechanisms |  |
Derivative assets: |  |
Total derivative assets – gross | 1.4 | 3.0
Derivative liabilities: |  |
Total derivative liabilities – gross | (3.7) | (0.1)
Derivatives designated as hedging instruments |  |
Derivative assets: |  |
Total derivative assets – gross | 17.4 | 2.4
Derivative liabilities: |  |
Total derivative liabilities – gross | (12.3) | (1.4)
Derivatives designated as hedging instruments | Foreign currency contracts |  |
Derivative assets: |  |
Total derivative assets – gross | 17.4 | 1.5
Derivative liabilities: |  |
Total derivative liabilities – gross | 0.0 | (0.4)
Derivatives designated as hedging instruments | Cross-currency swaps |  |
Derivative assets: |  |
Total derivative assets – gross | 0.0 | 0.9
Derivatives designated as hedging instruments | Interest rate contracts |  |
Derivative liabilities: |  |
Total derivative liabilities – gross | (12.3) | (1.0)
Derivatives not designated as hedging instruments |  |
Derivative assets: |  |
Total derivative assets – gross | 82.3 | 227.1
Derivative liabilities: |  |
Total derivative liabilities – gross | (175.6) | (57.3)
Derivatives not designated as hedging instruments | Foreign currency contracts |  |
Derivative assets: |  |
Total derivative assets – gross | 41.6 | 19.1
Derivative liabilities: |  |
Total derivative liabilities – gross | (4.3) | (14.0)
Derivatives not designated as hedging instruments | Commodity contracts |  |
Derivative assets: |  |
Total derivative assets – gross | 40.7 | 208.0
Derivative liabilities: |  |
Total derivative liabilities – gross | $ (171.3) | $ (43.3)

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