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Debt (Narrative) (Details) |  |  |  | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 25, 2020 | Feb. 16, 2020 USD ($) | Jan. 16, 2020 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Jul. 24, 2020 | Dec. 31, 2019 USD ($) | Jul. 23, 2015
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Cancellation of debt income |  |  |  | $ 18,532,000 | $ 0 | $ 19,725,000 | $ 0 |  |  |
Loss on extinguishment of debt |  |  |  | 0 | $ 0 | $ 23,480,000 | $ 0 |  |  |
Minimum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Letter of credit, fee percentage |  |  |  |  |  | 1.50% |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Letter of credit, fee percentage |  |  |  |  |  | 3.00% |  |  |  |
Amended Facility | Accordion Feature |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Line of credit facility aggregate maximum borrowing capacity |  |  |  | 2,000,000,000.0 |  | $ 2,000,000,000.0 |  |  |  |
Senior Secured Credit Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Line of credit, unused capacity commitment fee percentage |  |  |  |  |  | 0.50% |  |  |  |
Credit facility, amount outstanding |  |  |  | 1,053,000,000.0 |  | $ 1,053,000,000.0 |  |  |  |
Total amount available for borrowings under credit facility |  |  |  | 645,900,000 |  | 645,900,000 |  |  |  |
Senior Secured Credit Facility | From September 30, 2020 through March 31, 2021 | Subsequent Event |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Consolidated leverage ratio |  |  |  |  |  |  |  | 5.50 |  |
Consolidated interest coverage ratio |  |  |  |  |  |  |  | 3.0 |  |
Senior Secured Credit Facility | At March 31, 2021 | Subsequent Event |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Consolidated leverage ratio |  |  |  |  |  |  |  | 5.75 |  |
Consolidated interest coverage ratio |  |  |  |  |  |  |  | 2.75 |  |
Senior Secured Credit Facility | For the remaining of the term agreement | Subsequent Event |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Consolidated leverage ratio |  |  |  |  |  |  |  | 5.50 |  |
Consolidated interest coverage ratio |  |  |  |  |  |  |  | 3.0 |  |
Senior Secured Credit Facility | Petroleum Products |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Credit facility, amount outstanding |  |  |  | 32,300,000 |  | $ 32,300,000 |  |  |  |
Senior Secured Credit Facility | Minimum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Line of credit, unused capacity commitment fee percentage |  |  |  |  |  | 0.25% |  |  |  |
Debt instrument covenant, requirement senior secured leverage ratio | 1.00 |  |  |  |  |  |  |  |  |
Senior Secured Credit Facility | Maximum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Line of credit, unused capacity commitment fee percentage |  |  |  |  |  | 0.50% |  |  |  |
Debt instrument covenant, requirement senior secured leverage ratio | 3.25 |  |  |  |  |  |  |  |  |
Senior Secured Credit Facility | Letters Of Credit |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Letter of credit, fee percentage |  |  |  |  |  | 2.75% |  |  |  |
Letters of credit, outstanding amount |  |  |  | 1,100,000 |  | $ 1,100,000 |  |  |  |
Senior Secured Credit Facility | Letters Of Credit | Maximum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Letters of credit, outstanding amount |  |  |  | 100,000,000.0 |  | 100,000,000.0 |  |  |  |
Senior Secured Credit Facility | Amended Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Credit facility, maximum borrowing capacity |  |  |  | 1,700,000,000 |  | 1,700,000,000 |  |  |  |
Senior Secured Credit Facility | Amended Facility | Accordion Feature |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Credit facility, maximum borrowing capacity |  |  |  | 300,000,000.0 |  | $ 300,000,000.0 |  |  |  |
Federal Funds Effective Rate |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  |  |  |  | 0.50% |  |  |  |
Federal Funds Effective Rate | Maximum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  |  |  |  | 1.00% |  |  |  |
LIBOR Rate | Maximum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  |  |  |  | 1.00% |  |  |  |
Eurodollar Rate |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  |  |  |  | 2.75% |  |  |  |
Eurodollar Rate | Minimum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  |  |  |  | 1.50% |  |  |  |
Eurodollar Rate | Maximum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  |  |  |  | 3.00% |  |  |  |
Alternate Base Rate | Minimum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Letter of credit, fee percentage |  |  |  |  |  | 0.50% |  |  |  |
Alternate Base Rate | Maximum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Letter of credit, fee percentage |  |  |  |  |  | 2.00% |  |  |  |
Applicable Margin |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  |  |  |  | 1.75% |  |  |  |
2028 Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt issued |  |  | $ 750,000,000.0 | $ 727,044,000 |  | $ 727,044,000 |  |  | $ 0 |
Senior unsecured notes, stated rate |  |  | 7.75% | 775.00% |  | 775.00% |  |  | 775.00% |
Proceeds from issuance of debt |  |  | $ 736,700,000 |  |  |  |  |  |  |
2022 Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt issued |  |  |  | $ 0 |  | $ 0 |  |  | $ 750,000,000 |
Senior unsecured notes, stated rate |  |  |  | 675.00% |  | 675.00% |  |  | 675.00% | 6.75%
Proceeds used to repay unsecured debt principal |  | $ 222,100,000 | $ 527,900,000 |  |  |  |  |  |  |

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