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Acquisitions (Acquisition of MarEn Bakken) (Details) bbl / d in Thousands, $ in Millions |  | 11 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 15, 2017 USD ($) Quarterly_reporting_period bbl / d | Dec. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Payments to acquire equity method investments |  |  |  | $ 341.0 | $ 761.0 | $ 87.0
Income/(loss) from equity method investments | [1],[2] |  |  | 240.0 | $ 78.0 | $ (74.0)
MPC |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Incentive distribution rights forfeited per quarter |  | $ 1.6 |  |  |  |
Number of quarters IDRs forfeited | Quarterly_reporting_period |  | 12 |  |  |  |
Prorated incentive distribution rights forfeited |  | $ 0.8 |  |  |  |
MarEn Bakken |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Payments to acquire equity method investments |  | $ 2,000.0 |  |  |  |
MarEn Bakken |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Barrels Handled | bbl / d |  | 520 |  |  |  |
Payments to acquire equity method investments |  | $ 500.0 |  |  |  |
Percentage of ownership interest in joint venture acquired |  | 25.00% |  |  |  |
Income/(loss) from equity method investments |  |  | $ 15.0 | $ 48.0 |  |
Bakken Pipeline System |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Percentage of ownership interest in joint venture acquired |  | 37.00% |  |  |  |
Equity method investment, ownership percentage |  | 9.00% |  |  |  |
[1] | Includes an impairment expense of $89 million related to one of MPLX’s equity method investments for the year ended December 31, 2016.
[2] | “Income/(loss) from equity method investments” includes the impact of any basis differential amortization or accretion.

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