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Derivative Instruments, Hedging Activities and Fair Value Measurements, Recurring Fair Value Measurements (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Financial liabilities [Abstract] |  |  |  |  |  |
Liquidity option agreement |  | $ 390.0 |  | $ 333.9 |  |
Total gains (losses) included in: |  |  |  |  |  |
Unrealized gain (loss) recognized as a component of net income related to financial assets and liabilities |  | (17.8) |  | (22.8) |  | $ (45.0)
Fair Value, Measurements, Recurring [Member] |  |  |  |  |  |
Financial assets [Abstract] |  |  |  |  |  |
Interest rate derivatives |  |  |  | 0.1 |  |
Value before application of CME Rule 814 |  | 456.9 |  | 234.9 |  |
Impact of CME Rule 814 change |  | (295.0) |  | (73.2) |  |
Total commodity derivatives |  | 161.9 |  | 161.7 |  |
Financial assets |  | 161.9 |  | 161.8 |  |
Financial liabilities [Abstract] |  |  |  |  |  |
Liquidity option agreement |  | 390.0 |  | 333.9 |  |
Interest rate derivatives |  |  |  | 1.7 |  |
Commodity derivatives: |  |  |  |  |  |
Value before application of CME Rule 814 |  | 398.1 |  | 390.7 |  |
Impact of CME Rule 814 change |  | (235.7) |  | (213.8) |  |
Total commodity derivatives |  | 162.4 |  | 176.9 |  |
Financial liabilities |  | 552.4 |  | 512.5 |  |
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] |  |  |  |  |  |
Financial assets [Abstract] |  |  |  |  |  |
Interest rate derivatives |  |  |  | 0.0 |  |
Value before application of CME Rule 814 |  | 172.3 |  | 47.1 |  |
Impact of CME Rule 814 change |  | (134.8) |  | (47.1) |  |
Total commodity derivatives |  | 37.5 |  | 0.0 |  |
Financial assets |  | 37.5 |  | 0.0 |  |
Financial liabilities [Abstract] |  |  |  |  |  |
Liquidity option agreement |  | 0.0 |  | 0.0 |  |
Interest rate derivatives |  |  |  | 0.0 |  |
Commodity derivatives: |  |  |  |  |  |
Value before application of CME Rule 814 |  | 85.5 |  | 118.4 |  |
Impact of CME Rule 814 change |  | (48.6) |  | (118.4) |  |
Total commodity derivatives |  | 36.9 |  | 0.0 |  |
Financial liabilities |  | 36.9 |  | 0.0 |  |
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] |  |  |  |  |  |
Financial assets [Abstract] |  |  |  |  |  |
Interest rate derivatives |  |  |  | 0.1 |  |
Value before application of CME Rule 814 |  | 282.4 |  | 184.9 |  |
Impact of CME Rule 814 change |  | (159.3) |  | (26.1) |  |
Total commodity derivatives |  | 123.1 |  | 158.8 |  |
Financial assets |  | 123.1 |  | 158.9 |  |
Financial liabilities [Abstract] |  |  |  |  |  |
Liquidity option agreement |  | 0.0 |  | 0.0 |  |
Interest rate derivatives |  |  |  | 1.7 |  |
Commodity derivatives: |  |  |  |  |  |
Value before application of CME Rule 814 |  | 291.2 |  | 270.6 |  |
Impact of CME Rule 814 change |  | (172.9) |  | (95.4) |  |
Total commodity derivatives |  | 118.3 |  | 175.2 |  |
Financial liabilities |  | 118.3 |  | 176.9 |  |
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] |  |  |  |  |  |
Financial assets [Abstract] |  |  |  |  |  |
Interest rate derivatives |  |  |  | 0.0 |  |
Value before application of CME Rule 814 |  | 2.2 |  | 2.9 |  |
Impact of CME Rule 814 change |  | (0.9) |  | 0.0 |  |
Total commodity derivatives |  | 1.3 |  | 2.9 |  |
Financial assets |  | 1.3 |  | 2.9 |  |
Financial liabilities [Abstract] |  |  |  |  |  |
Liquidity option agreement |  | 390.0 |  | 333.9 |  |
Interest rate derivatives |  |  |  | 0.0 |  |
Commodity derivatives: |  |  |  |  |  |
Value before application of CME Rule 814 |  | 21.4 |  | 1.7 |  |
Impact of CME Rule 814 change |  | (14.2) |  | 0.0 |  |
Total commodity derivatives |  | 7.2 |  | 1.7 |  |
Financial liabilities |  | 397.2 |  | 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) | [1] | (268.2) |  |
Total gains (losses) included in: |  |  |  |  |  |
Transfers out of Level 3 | [1] | (2.7) |  | (0.2) |  |
Financial liability balance, net, end of period |  | (395.9) | [1] | (332.7) | [1] | $ (268.2)
Unrealized gain (loss) recognized as a component of net income related to financial assets and liabilities |  | (1.2) |  | (0.1) |  |
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Other Comprehensive Income (Loss) [Member] |  |  |  |  |  |
Total gains (losses) included in: |  |  |  |  |  |
Other comprehensive income (loss) |  | (3.2) |  | 0.1 |  |
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Revenue [Member] |  |  |  |  |  |
Total gains (losses) included in: |  |  |  |  |  |
Net income | [2] | 0.7 |  | 2.3 |  |
Settlements | [2] | (1.9) |  | (2.4) |  |
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Other Expense [Member] |  |  |  |  |  |
Total gains (losses) included in: |  |  |  |  |  |
Net income |  | $ (56.1) |  | $ (64.3) |  |
[1] | Transfers out of Level 3 into Level 2 were due to shorter remaining transaction maturities falling inside of the Level 2 range at December 31, 2018 and 2017.
[2] | There were $1.2 million and $0.1 million of unrealized losses included in these amounts for the years ended December 31, 2018 and 2017, respectively.

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