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Equity-Method Investments (Tables) | 12 Months Ended
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Dec. 31, 2018
Equity Method Investments and Joint Ventures [Abstract] |
Schedule of Equity Method Investment Recorded in Consolidated Statements of Operations | The following amounts related to this equity-method investment were recorded in our Consolidated Statements of Operations (in millions):
Year Ended December 31, |  | 2018 |  | 2017 |  | 2016
Asset impairments to write investment down to fair value |  | $ | — |  |  | $ | — |  |  | $ | 14.0 |
Our portion of the partnership’s operating losses |  | — |  |  | — |  |  | 8.3 |
Non-cash interest expense related to the amortization of the discounted fair value of future equity contributions |  | — |  |  | — |  |  | 0.2 |
Tax benefits and credits generated |  | — |  |  | — |  |  | 28.5 |

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- Definition Tabular disclosure of summarized financial information in income statement for equity method investment. + References No definition available. + Details
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