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Derivative Instruments, Hedging Activities and Fair Value Measurements, Recurring Fair Value Measurements (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Sep. 30, 2018 | Sep. 30, 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 |  |  |  |  |  |  |  | $ (254.9) | $ 14.2 |
Fair Value, Measurements, Recurring [Member] |  |  |  |  |  |  |  |  |  |
Financial assets [Abstract] |  |  |  |  |  |  |  |  |  |
Interest rate derivatives |  | $ 19.1 |  |  |  |  |  | 19.1 |  | $ 0.1
Value before application of CME Rule 814 |  | 430.4 |  |  |  |  |  | 430.4 |  | 234.9
Impact of CME Rule 814 change |  | (147.0) |  |  |  |  |  | (147.0) |  | (73.2)
Total commodity derivatives |  | 283.4 |  |  |  |  |  | 283.4 |  | 161.7
Total |  | 302.5 |  |  |  |  |  | 302.5 |  | 161.8
Financial liabilities [Abstract] |  |  |  |  |  |  |  |  |  |
Liquidity option agreement |  | 368.8 |  |  |  |  |  | 368.8 |  | 333.9
Interest rate derivatives |  | 0.0 |  |  |  |  |  | 0.0 |  | 1.7
Commodity derivatives: |  |  |  |  |  |  |  |  |  |
Value before application of CME Rule 814 |  | 1,014.5 |  |  |  |  |  | 1,014.5 |  | 390.7
Impact of CME Rule 814 change |  | (454.0) |  |  |  |  |  | (454.0) |  | (213.8)
Total commodity derivatives |  | 560.5 |  |  |  |  |  | 560.5 |  | 176.9
Total |  | 929.3 |  |  |  |  |  | 929.3 |  | 512.5
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] |  |  |  |  |  |  |  |  |  |
Financial assets [Abstract] |  |  |  |  |  |  |  |  |  |
Interest rate derivatives |  | 0.0 |  |  |  |  |  | 0.0 |  | 0.0
Value before application of CME Rule 814 |  | 140.5 |  |  |  |  |  | 140.5 |  | 47.1
Impact of CME Rule 814 change |  | (11.5) |  |  |  |  |  | (11.5) |  | (47.1)
Total commodity derivatives |  | 129.0 |  |  |  |  |  | 129.0 |  | 0.0
Total |  | 129.0 |  |  |  |  |  | 129.0 |  | 0.0
Financial liabilities [Abstract] |  |  |  |  |  |  |  |  |  |
Liquidity option agreement |  | 0.0 |  |  |  |  |  | 0.0 |  | 0.0
Interest rate derivatives |  | 0.0 |  |  |  |  |  | 0.0 |  | 0.0
Commodity derivatives: |  |  |  |  |  |  |  |  |  |
Value before application of CME Rule 814 |  | 183.7 |  |  |  |  |  | 183.7 |  | 118.4
Impact of CME Rule 814 change |  | (55.5) |  |  |  |  |  | (55.5) |  | (118.4)
Total commodity derivatives |  | 128.2 |  |  |  |  |  | 128.2 |  | 0.0
Total |  | 128.2 |  |  |  |  |  | 128.2 |  | 0.0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] |  |  |  |  |  |  |  |  |  |
Financial assets [Abstract] |  |  |  |  |  |  |  |  |  |
Interest rate derivatives |  | 19.1 |  |  |  |  |  | 19.1 |  | 0.1
Value before application of CME Rule 814 |  | 284.0 |  |  |  |  |  | 284.0 |  | 184.9
Impact of CME Rule 814 change |  | (135.5) |  |  |  |  |  | (135.5) |  | (26.1)
Total commodity derivatives |  | 148.5 |  |  |  |  |  | 148.5 |  | 158.8
Total |  | 167.6 |  |  |  |  |  | 167.6 |  | 158.9
Financial liabilities [Abstract] |  |  |  |  |  |  |  |  |  |
Liquidity option agreement |  | 0.0 |  |  |  |  |  | 0.0 |  | 0.0
Interest rate derivatives |  | 0.0 |  |  |  |  |  | 0.0 |  | 1.7
Commodity derivatives: |  |  |  |  |  |  |  |  |  |
Value before application of CME Rule 814 |  | 827.5 |  |  |  |  |  | 827.5 |  | 270.6
Impact of CME Rule 814 change |  | (398.5) |  |  |  |  |  | (398.5) |  | (95.4)
Total commodity derivatives |  | 429.0 |  |  |  |  |  | 429.0 |  | 175.2
Total |  | 429.0 |  |  |  |  |  | 429.0 |  | 176.9
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] |  |  |  |  |  |  |  |  |  |
Financial assets [Abstract] |  |  |  |  |  |  |  |  |  |
Interest rate derivatives |  | 0.0 |  |  |  |  |  | 0.0 |  | 0.0
Value before application of CME Rule 814 |  | 5.9 |  |  |  |  |  | 5.9 |  | 2.9
Impact of CME Rule 814 change |  | 0.0 |  |  |  |  |  | 0.0 |  | 0.0
Total commodity derivatives |  | 5.9 |  |  |  |  |  | 5.9 |  | 2.9
Total |  | 5.9 |  |  |  |  |  | 5.9 |  | 2.9
Financial liabilities [Abstract] |  |  |  |  |  |  |  |  |  |
Liquidity option agreement |  | 368.8 |  |  |  |  |  | 368.8 |  | 333.9
Interest rate derivatives |  | 0.0 |  |  |  |  |  | 0.0 |  | 0.0
Commodity derivatives: |  |  |  |  |  |  |  |  |  |
Value before application of CME Rule 814 |  | 3.3 |  |  |  |  |  | 3.3 |  | 1.7
Impact of CME Rule 814 change |  | 0.0 |  |  |  |  |  | 0.0 |  | 0.0
Total commodity derivatives |  | 3.3 |  |  |  |  |  | 3.3 |  | 1.7
Total |  | 372.1 |  |  |  |  |  | 372.1 |  | $ 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 |  | (349.0) | $ (341.9) | $ (332.7) | $ (293.5) | $ (274.4) | $ (268.2) | (332.7) | (268.2) |
Total gains (losses) included in: |  |  |  |  |  |  |  |  |  |
Transfers out of Level 3 |  | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |  |  |
Financial liability balance, net, end of period |  | (366.2) | (349.0) | (341.9) | (302.2) | (293.5) | (274.4) | (366.2) | (302.2) |
Unrealized gain (loss) recognized as a component of net income related to financial assets and liabilities |  | (1.5) |  |  | 0.2 |  |  | $ (1.4) | $ (1.1) |
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Revenue [Member] |  |  |  |  |  |  |  |  |  |
Total gains (losses) included in: |  |  |  |  |  |  |  |  |  |
Net income | [1] | (0.2) | 1.3 | (0.5) | 0.3 | 0.1 | 0.7 |  |  |
Settlements | [1] | (1.3) | 0.5 | (1.2) | (0.1) | (0.7) | (1.4) |  |  |
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Other Expense [Member] |  |  |  |  |  |  |  |  |  |
Total gains (losses) included in: |  |  |  |  |  |  |  |  |  |
Net income |  | (18.5) | (8.9) | (7.5) | (8.9) | (18.6) | (5.5) |  |  |
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Other Comprehensive Income (Loss) [Member] |  |  |  |  |  |  |  |  |  |
Total gains (losses) included in: |  |  |  |  |  |  |  |  |  |
Other comprehensive income |  | $ 2.8 | $ 0.0 | $ 0.0 | $ 0.0 | $ 0.1 | $ 0.0 |  |  |
[1] | There were $1.5 million and $1.4 million of unrealized losses included in these amounts for the three and nine months ended September 30, 2018, respectively. There were unrealized gains of $0.2 million and unrealized losses of $1.1 million included in these amounts for the three and nine months ended September 30, 2017.

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