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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, 2018 | Sep. 30, 2017
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Derivative assets: |  |
Total derivative assets – gross | $ 232.5 | $ 116.3
Gross amounts offset in the balance sheet | (34.3) | (35.7)
Cash collateral received | (12.2) | (8.3)
Total derivative assets – net | 186.0 | 72.3
Derivative liabilities: |  |
Total derivative liabilities – gross | (58.8) | (82.5)
Gross amounts offset in the balance sheet | 34.3 | 35.7
Total derivative liabilities – net | (24.5) | (46.8)
Commodity contract - subject to PGC and DS mechanisms |  |
Derivative assets: |  |
Total derivative assets – gross | 3.0 | 1.7
Derivative liabilities: |  |
Total derivative liabilities – gross | (0.1) | (1.5)
Derivatives designated as hedging instruments |  |
Derivative assets: |  |
Total derivative assets – gross | 2.4 | 3.2
Derivative liabilities: |  |
Total derivative liabilities – gross | (1.4) | (10.7)
Derivatives designated as hedging instruments | Foreign currency contracts |  |
Derivative assets: |  |
Total derivative assets – gross | 1.5 | 3.2
Derivative liabilities: |  |
Total derivative liabilities – gross | (0.4) | (5.5)
Derivatives designated as hedging instruments | Cross-currency swaps |  |
Derivative assets: |  |
Total derivative assets – gross | 0.9 | 0.0
Derivative liabilities: |  |
Total derivative liabilities – gross | 0.0 | (2.9)
Derivatives designated as hedging instruments | Interest rate contracts |  |
Derivative liabilities: |  |
Total derivative liabilities – gross | (1.0) | (2.3)
Derivatives not designated as hedging instruments |  |
Derivative assets: |  |
Total derivative assets – gross | 227.1 | 111.4
Derivative liabilities: |  |
Total derivative liabilities – gross | (57.3) | (70.3)
Derivatives not designated as hedging instruments | Foreign currency contracts |  |
Derivative assets: |  |
Total derivative assets – gross | 19.1 | 9.0
Derivative liabilities: |  |
Total derivative liabilities – gross | (14.0) | (32.7)
Derivatives not designated as hedging instruments | Commodity contracts |  |
Derivative assets: |  |
Total derivative assets – gross | 208.0 | 102.4
Derivative liabilities: |  |
Total derivative liabilities – gross | $ (43.3) | $ (37.6)

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