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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, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Total gains (losses) included in: |  |  |  |  |  |  |  |  |  |
Unrealized gain (loss) recognized as a component of net income related to financial assets and liabilities |  | $ (85.8) |  |  | $ 204.1 |  |  | $ (2.0) | $ (254.9) |
Fair Value, Measurements, Recurring [Member] |  |  |  |  |  |  |  |  |  |
Financial assets [Abstract] |  |  |  |  |  |  |  |  |  |
Value before application of CME Rule 814 |  | 433.9 |  |  |  |  |  | 433.9 |  | $ 456.9
Impact of CME Rule 814 |  | (261.3) |  |  |  |  |  | (261.3) |  | (295.0)
Total commodity derivatives |  | 172.6 |  |  |  |  |  | 172.6 |  | 161.9
Total |  | 172.6 |  |  |  |  |  | 172.6 |  | 161.9
Financial liabilities [Abstract] |  |  |  |  |  |  |  |  |  |
Liquidity option agreement |  | 513.1 |  |  |  |  |  | 513.1 |  | 390.0
Interest rate derivatives |  | 118.6 |  |  |  |  |  | 118.6 |  |
Commodity derivatives: |  |  |  |  |  |  |  |  |  |
Value before application of CME Rule 814 |  | 356.0 |  |  |  |  |  | 356.0 |  | 398.1
Impact of CME Rule 814 |  | (205.5) |  |  |  |  |  | (205.5) |  | (235.7)
Total commodity derivatives |  | 150.5 |  |  |  |  |  | 150.5 |  | 162.4
Total |  | 782.2 |  |  |  |  |  | 782.2 |  | 552.4
Net value before application of CME Rule 814 to commodity hedging portfolio |  | 77.9 |  |  |  |  |  | 77.9 |  |
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] |  |  |  |  |  |  |  |  |  |
Financial assets [Abstract] |  |  |  |  |  |  |  |  |  |
Value before application of CME Rule 814 |  | 54.0 |  |  |  |  |  | 54.0 |  | 172.3
Impact of CME Rule 814 |  | (44.8) |  |  |  |  |  | (44.8) |  | (134.8)
Total commodity derivatives |  | 9.2 |  |  |  |  |  | 9.2 |  | 37.5
Total |  | 9.2 |  |  |  |  |  | 9.2 |  | 37.5
Financial liabilities [Abstract] |  |  |  |  |  |  |  |  |  |
Liquidity option agreement |  | 0.0 |  |  |  |  |  | 0.0 |  | 0.0
Interest rate derivatives |  | 0.0 |  |  |  |  |  | 0.0 |  |
Commodity derivatives: |  |  |  |  |  |  |  |  |  |
Value before application of CME Rule 814 |  | 39.8 |  |  |  |  |  | 39.8 |  | 85.5
Impact of CME Rule 814 |  | (31.0) |  |  |  |  |  | (31.0) |  | (48.6)
Total commodity derivatives |  | 8.8 |  |  |  |  |  | 8.8 |  | 36.9
Total |  | 8.8 |  |  |  |  |  | 8.8 |  | 36.9
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] |  |  |  |  |  |  |  |  |  |
Financial assets [Abstract] |  |  |  |  |  |  |  |  |  |
Value before application of CME Rule 814 |  | 365.4 |  |  |  |  |  | 365.4 |  | 282.4
Impact of CME Rule 814 |  | (206.3) |  |  |  |  |  | (206.3) |  | (159.3)
Total commodity derivatives |  | 159.1 |  |  |  |  |  | 159.1 |  | 123.1
Total |  | 159.1 |  |  |  |  |  | 159.1 |  | 123.1
Financial liabilities [Abstract] |  |  |  |  |  |  |  |  |  |
Liquidity option agreement |  | 0.0 |  |  |  |  |  | 0.0 |  | 0.0
Interest rate derivatives |  | 118.6 |  |  |  |  |  | 118.6 |  |
Commodity derivatives: |  |  |  |  |  |  |  |  |  |
Value before application of CME Rule 814 |  | 268.3 |  |  |  |  |  | 268.3 |  | 291.2
Impact of CME Rule 814 |  | (138.5) |  |  |  |  |  | (138.5) |  | (172.9)
Total commodity derivatives |  | 129.8 |  |  |  |  |  | 129.8 |  | 118.3
Total |  | 248.4 |  |  |  |  |  | 248.4 |  | 118.3
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] |  |  |  |  |  |  |  |  |  |
Financial assets [Abstract] |  |  |  |  |  |  |  |  |  |
Value before application of CME Rule 814 |  | 14.5 |  |  |  |  |  | 14.5 |  | 2.2
Impact of CME Rule 814 |  | (10.2) |  |  |  |  |  | (10.2) |  | (0.9)
Total commodity derivatives |  | 4.3 |  |  |  |  |  | 4.3 |  | 1.3
Total |  | 4.3 |  |  |  |  |  | 4.3 |  | 1.3
Financial liabilities [Abstract] |  |  |  |  |  |  |  |  |  |
Liquidity option agreement |  | 513.1 |  |  |  |  |  | 513.1 |  | 390.0
Interest rate derivatives |  | 0.0 |  |  |  |  |  | 0.0 |  |
Commodity derivatives: |  |  |  |  |  |  |  |  |  |
Value before application of CME Rule 814 |  | 47.9 |  |  |  |  |  | 47.9 |  | 21.4
Impact of CME Rule 814 |  | (36.0) |  |  |  |  |  | (36.0) |  | (14.2)
Total commodity derivatives |  | 11.9 |  |  |  |  |  | 11.9 |  | 7.2
Total |  | 525.0 |  |  |  |  |  | 525.0 |  | $ 397.2
Reconciliation of changes in the fair value of Level 3 financial assets and liabilities [Roll Forward] |  |  |  |  |  |  |  |  |  |
Financial liability balance, net, beginning of period |  | (479.6) | $ (446.9) | $ (395.9) | (349.0) | $ (341.9) | $ (332.7) | (395.9) | (332.7) |
Total gains (losses) included in: |  |  |  |  |  |  |  |  |  |
Transfers out of Level 3 |  | 0.0 | 0.0 | (0.2) | 0.0 | 0.0 | 0.0 |  |  |
Financial liability balance, net, end of period |  | (520.7) | (479.6) | (446.9) | (366.2) | (349.0) | (341.9) | (520.7) | (366.2) |
Unrealized gain (loss) recognized as a component of net income related to financial assets and liabilities |  | 0.8 |  |  | (1.5) |  |  | $ 0.6 | $ (1.4) |
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Revenue [Member] |  |  |  |  |  |  |  |  |  |
Total gains (losses) included in: |  |  |  |  |  |  |  |  |  |
Net income | [1] | 0.8 | (0.1) | 3.1 | (0.2) | 1.3 | (0.5) |  |  |
Settlements | [1] | 0.0 | (3.1) | (0.1) | (1.3) | 0.5 | (1.2) |  |  |
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Other Expense [Member] |  |  |  |  |  |  |  |  |  |
Total gains (losses) included in: |  |  |  |  |  |  |  |  |  |
Net income |  | (38.7) | (26.6) | (57.8) | (18.5) | (8.9) | (7.5) |  |  |
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Other Comprehensive Income (Loss) [Member] |  |  |  |  |  |  |  |  |  |
Total gains (losses) included in: |  |  |  |  |  |  |  |  |  |
Other comprehensive income |  | $ (3.2) | $ (2.9) | $ 4.0 | $ 2.8 | $ 0.0 | $ 0.0 |  |  |
[1] | There were $0.8 million and $0.6 million of unrealized gains included in these amounts for the three and nine months ended September 30, 2019, respectively. There were unrealized losses of $1.5 million and $1.4 million, respectively, included in these amounts for the three and nine months ended September 30, 2018.

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