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v3.19.1

Derivative Instruments, Hedging Activities and Fair Value Measurements, Recurring Fair Value Measurements (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 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 |  | $ 96.3 | $ (136.9) |
Fair Value, Measurements, Recurring [Member] |  |  |  |
Financial assets [Abstract] |  |  |  |
Value before application of CME Rule 814 |  | 309.3 |  | $ 456.9
Impact of CME Rule 814 |  | (170.9) |  | (295.0)
Total commodity derivatives |  | 138.4 |  | 161.9
Total |  | 138.4 |  | 161.9
Financial liabilities [Abstract] |  |  |  |
Liquidity option agreement |  | 447.8 |  | 390.0
Commodity derivatives: |  |  |  |
Value before application of CME Rule 814 |  | 244.0 |  | 398.1
Impact of CME Rule 814 |  | (135.6) |  | (235.7)
Total commodity derivatives |  | 108.4 |  | 162.4
Total |  | 556.2 |  | 552.4
Net value before application of CME Rule 814 to commodity hedging portfolio |  | 65.3 |  |
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] |  |  |  |
Financial assets [Abstract] |  |  |  |
Value before application of CME Rule 814 |  | 82.9 |  | 172.3
Impact of CME Rule 814 |  | (47.9) |  | (134.8)
Total commodity derivatives |  | 35.0 |  | 37.5
Total |  | 35.0 |  | 37.5
Financial liabilities [Abstract] |  |  |  |
Liquidity option agreement |  | 0.0 |  | 0.0
Commodity derivatives: |  |  |  |
Value before application of CME Rule 814 |  | 87.6 |  | 85.5
Impact of CME Rule 814 |  | (53.1) |  | (48.6)
Total commodity derivatives |  | 34.5 |  | 36.9
Total |  | 34.5 |  | 36.9
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] |  |  |  |
Financial assets [Abstract] |  |  |  |
Value before application of CME Rule 814 |  | 219.9 |  | 282.4
Impact of CME Rule 814 |  | (120.4) |  | (159.3)
Total commodity derivatives |  | 99.5 |  | 123.1
Total |  | 99.5 |  | 123.1
Financial liabilities [Abstract] |  |  |  |
Liquidity option agreement |  | 0.0 |  | 0.0
Commodity derivatives: |  |  |  |
Value before application of CME Rule 814 |  | 145.5 |  | 291.2
Impact of CME Rule 814 |  | (74.6) |  | (172.9)
Total commodity derivatives |  | 70.9 |  | 118.3
Total |  | 70.9 |  | 118.3
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] |  |  |  |
Financial assets [Abstract] |  |  |  |
Value before application of CME Rule 814 |  | 6.5 |  | 2.2
Impact of CME Rule 814 |  | (2.6) |  | (0.9)
Total commodity derivatives |  | 3.9 |  | 1.3
Total |  | 3.9 |  | 1.3
Financial liabilities [Abstract] |  |  |  |
Liquidity option agreement |  | 447.8 |  | 390.0
Commodity derivatives: |  |  |  |
Value before application of CME Rule 814 |  | 10.9 |  | 21.4
Impact of CME Rule 814 |  | (7.9) |  | (14.2)
Total commodity derivatives |  | 3.0 |  | 7.2
Total |  | 450.8 |  | $ 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 |  | (395.9) | (332.7) |
Total gains (losses) included in: |  |  |  |
Transfers out of Level 3 |  | (0.2) | 0.0 |
Financial liability balance, net, end of period |  | (446.9) | (341.9) |
Unrealized gain (loss) recognized as a component of net income related to financial assets and liabilities |  | 3.0 | (1.7) |
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Revenue [Member] |  |  |  |
Total gains (losses) included in: |  |  |  |
Net income | [1] | 3.1 | (0.5) |
Settlements | [1] | (0.1) | (1.2) |
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Other Expense [Member] |  |  |  |
Total gains (losses) included in: |  |  |  |
Net income |  | (57.8) | (7.5) |
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Other Comprehensive Income (Loss) [Member] |  |  |  |
Total gains (losses) included in: |  |  |  |
Other comprehensive income |  | $ 4.0 | $ 0.0 |
[1] | There were unrealized gains of $3.0 million and unrealized losses of $1.7 million included in these amounts for the three months ended March 31, 2019 and 2018, respectively.

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