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Derivative Instruments, Hedging Activities and Fair Value Measurements, Recurring Fair Value Measurements (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Total gains (losses) included in: |  |  |  |
Unrealized gain (loss) recognized as a component of net income related to financial assets and liabilities |  | $ (136.9) | $ 20.3 |
Fair Value, Measurements, Recurring [Member] |  |  |  |
Financial assets [Abstract] |  |  |  |
Interest rate derivatives |  | 9.5 |  | $ 0.1
Value before application of CME Rule 814 |  | 127.8 |  | 234.9
Impact of CME Rule 814 change |  | (42.5) |  | (73.2)
Total commodity derivatives |  | 85.3 |  | 161.7
Total |  | 94.8 |  | 161.8
Financial liabilities [Abstract] |  |  |  |
Liquidity option agreement |  | 341.4 |  | 333.9
Interest rate derivatives |  | 1.6 |  | 1.7
Commodity derivatives: |  |  |  |
Value before application of CME Rule 814 |  | 340.6 |  | 390.7
Impact of CME Rule 814 change |  | (157.6) |  | (213.8)
Total commodity derivatives |  | 183.0 |  | 176.9
Total |  | 526.0 |  | 512.5
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] |  |  |  |
Financial assets [Abstract] |  |  |  |
Interest rate derivatives |  | 0.0 |  | 0.0
Value before application of CME Rule 814 |  | 29.5 |  | 47.1
Impact of CME Rule 814 change |  | (27.0) |  | (47.1)
Total commodity derivatives |  | 2.5 |  | 0.0
Total |  | 2.5 |  | 0.0
Financial liabilities [Abstract] |  |  |  |
Liquidity option agreement |  | 0.0 |  | 0.0
Interest rate derivatives |  | 0.0 |  | 0.0
Commodity derivatives: |  |  |  |
Value before application of CME Rule 814 |  | 64.3 |  | 118.4
Impact of CME Rule 814 change |  | (41.3) |  | (118.4)
Total commodity derivatives |  | 23.0 |  | 0.0
Total |  | 23.0 |  | 0.0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] |  |  |  |
Financial assets [Abstract] |  |  |  |
Interest rate derivatives |  | 9.5 |  | 0.1
Value before application of CME Rule 814 |  | 97.9 |  | 184.9
Impact of CME Rule 814 change |  | (15.5) |  | (26.1)
Total commodity derivatives |  | 82.4 |  | 158.8
Total |  | 91.9 |  | 158.9
Financial liabilities [Abstract] |  |  |  |
Liquidity option agreement |  | 0.0 |  | 0.0
Interest rate derivatives |  | 1.6 |  | 1.7
Commodity derivatives: |  |  |  |
Value before application of CME Rule 814 |  | 275.4 |  | 270.6
Impact of CME Rule 814 change |  | (116.3) |  | (95.4)
Total commodity derivatives |  | 159.1 |  | 175.2
Total |  | 160.7 |  | 176.9
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] |  |  |  |
Financial assets [Abstract] |  |  |  |
Interest rate derivatives |  | 0.0 |  | 0.0
Value before application of CME Rule 814 |  | 0.4 |  | 2.9
Impact of CME Rule 814 change |  | 0.0 |  | 0.0
Total commodity derivatives |  | 0.4 |  | 2.9
Total |  | 0.4 |  | 2.9
Financial liabilities [Abstract] |  |  |  |
Liquidity option agreement |  | 341.4 |  | 333.9
Interest rate derivatives |  | 0.0 |  | 0.0
Commodity derivatives: |  |  |  |
Value before application of CME Rule 814 |  | 0.9 |  | 1.7
Impact of CME Rule 814 change |  | 0.0 |  | 0.0
Total commodity derivatives |  | 0.9 |  | 1.7
Total |  | 342.3 |  | $ 335.6
Reconciliation of changes in the fair value of Level 3 financial assets and liabilities [Roll Forward] |  |  |  |
Financial liability balance, net, beginning of period |  | (332.7) | (268.2) |
Total gains (losses) included in: |  |  |  |
Transfers out of Level 3 |  | 0.0 | 0.0 |
Financial liability balance, net, end of period |  | (341.9) | (274.4) |
Unrealized gain (loss) recognized as a component of net income related to financial assets and liabilities |  | (1.7) | (0.7) |
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Revenue [Member] |  |  |  |
Total gains (losses) included in: |  |  |  |
Net income | [1] | (0.5) | 0.7 |
Settlements | [1] | (1.2) | (1.4) |
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Other Expense [Member] |  |  |  |
Total gains (losses) included in: |  |  |  |
Net income |  | (7.5) | (5.5) |
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Other Comprehensive Income (Loss) [Member] |  |  |  |
Total gains (losses) included in: |  |  |  |
Other comprehensive income |  | $ 0.0 | $ 0.0 |
[1] | There were unrealized losses of $1.7 million and $0.7 million included in these amounts for the three months ended March 31, 2018 and 2017, respectively.

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