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Derivative Instruments, Hedging Activities and Fair Value Measurements, Asset Balance Sheet Offsetting (Details) - USD ($) $ in Millions | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Interest rate derivatives [Member] |  |
Offsetting Assets [Line Items] |  |
Gross Amounts of Recognized Assets | $ 9.5 | $ 0.1
Gross Amounts Offset in the Balance Sheet | 0.0 | 0.0
Amounts of Assets Presented in the Balance Sheet | 9.5 | 0.1
Financial Instruments | (0.3) | (0.1)
Cash Collateral Received | 0.0 | 0.0
Cash Collateral Paid | 0.0 | 0.0
Amounts That Would Have Been Presented On Net Basis | 9.2 | 0.0
Commodity Derivatives [Member] |  |
Offsetting Assets [Line Items] |  |
Gross Amounts of Recognized Assets | 85.3 | 161.7
Gross Amounts Offset in the Balance Sheet | 0.0 | 0.0
Amounts of Assets Presented in the Balance Sheet | 85.3 | 161.7
Financial Instruments | (84.6) | (157.8)
Cash Collateral Received | 0.0 | 0.0
Cash Collateral Paid | 0.0 | 0.0
Amounts That Would Have Been Presented On Net Basis | $ 0.7 | $ 3.9

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- Definition Fair value of liability associated with financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226003-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959 + Details
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