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Derivative Instruments and Hedging Activities - Fair Value of Derivative Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Derivative assets: |  |  |
Total derivative assets — gross | $ 131.2 | $ 116.3 | $ 154.0
Gross amounts offset in the balance sheet | (32.5) | (35.7) | (35.7)
Cash collateral received | (12.0) | (8.3) | (7.1)
Total derivative assets — net | 86.7 | 72.3 | 111.2
Derivative liabilities: |  |  |
Total derivative liabilities — gross | (87.4) | (82.5) | (68.5)
Gross amounts offset in the balance sheet | 32.5 | 35.7 | 35.7
Total derivative liabilities — net | (54.9) | (46.8) | (32.8)
Derivatives designated as hedging instruments |  |  |
Derivative assets: |  |  |
Total derivative assets — gross | 1.2 | 3.2 | 28.1
Derivative liabilities: |  |  |
Total derivative liabilities — gross | (8.6) | (10.7) | (2.8)
Derivatives designated as hedging instruments | Foreign currency contracts |  |  |
Derivative assets: |  |  |
Total derivative assets — gross | 1.2 | 3.2 | 24.6
Derivative liabilities: |  |  |
Total derivative liabilities — gross | (5.6) | (5.5) | 0.0
Derivatives designated as hedging instruments | Cross-currency contracts |  |  |
Derivative assets: |  |  |
Total derivative assets — gross | 0.0 | 0.0 | 3.5
Derivative liabilities: |  |  |
Total derivative liabilities — gross | (0.9) | (2.9) | 0.0
Derivatives designated as hedging instruments | Interest rate contracts |  |  |
Derivative liabilities: |  |  |
Total derivative liabilities — gross | (2.1) | (2.3) | (2.8)
Derivatives subject to PGC and DS mechanisms | Commodity contracts |  |  |
Derivative assets: |  |  |
Total derivative assets — gross | 0.4 | 1.7 | 6.9
Derivative liabilities: |  |  |
Total derivative liabilities — gross | (2.3) | (1.5) | (0.3)
Derivatives not designated as hedging instruments |  |  |
Derivative assets: |  |  |
Total derivative assets — gross | 129.6 | 111.4 | 119.0
Derivative liabilities: |  |  |
Total derivative liabilities — gross | (76.5) | (70.3) | (65.4)
Derivatives not designated as hedging instruments | Foreign currency contracts |  |  |
Derivative assets: |  |  |
Total derivative assets — gross | 10.4 | 9.0 | 1.4
Derivative liabilities: |  |  |
Total derivative liabilities — gross | (34.3) | (32.7) | (0.2)
Derivatives not designated as hedging instruments | Commodity contracts |  |  |
Derivative assets: |  |  |
Total derivative assets — gross | 119.2 | 102.4 | 117.6
Derivative liabilities: |  |  |
Total derivative liabilities — gross | $ (42.2) | $ (37.6) | $ (65.2)

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