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Derivative Instruments, Hedging Activities and Fair Value Measurements, Asset Balance Sheet Offsetting (Details) - USD ($) $ in Millions | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Interest rate derivatives [Member] |  |
Offsetting Assets [Line Items] |  |
Gross Amounts of Recognized Assets | $ 3.2 |
Gross Amounts Offset in the Balance Sheet | 0.0 |
Amounts of Assets Presented in the Balance Sheet | 3.2 |
Financial Instruments | (3.2) |
Cash Collateral Paid | 0.0 |
Cash Collateral Received | 0.0 |
Amounts That Would Have Been Presented On Net Basis | 0.0 |
Commodity derivatives [Member] |  |
Offsetting Assets [Line Items] |  |
Gross Amounts of Recognized Assets | 255.6 | $ 226.6
Gross Amounts Offset in the Balance Sheet | 0.0 | 0.0
Amounts of Assets Presented in the Balance Sheet | 255.6 | 226.6
Financial Instruments | (143.0) | (147.3)
Cash Collateral Paid | (40.1) | 0.0
Cash Collateral Received | (72.2) | (23.9)
Amounts That Would Have Been Presented On Net Basis | $ 0.3 | $ 55.4

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