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Summary of Significant Accounting Policies - Planned Major Maintenance Costs and Revenue Recognition (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Planned Major Maintenance Costs |  |  |  |  |  |  |  |  |
Turnaround costs |  |  |  |  |  |  | $ 83.0 | $ 38.1 | $ 109.2
Revenue Recognition |  |  |  |  |  |  |  |  |
Expected period of delivery of deferred revenue |  |  |  |  |  |  | 12 months |  |
Nitrogen fertilizer plants |  |  |  |  |  |  |  |  |
Planned Major Maintenance Costs |  |  |  |  |  |  |  |  |
Turnaround costs |  |  |  |  |  |  | $ 2.6 | 6.6 | 7.0
Coffeyville refinery |  |  |  |  |  |  |  |  |
Planned Major Maintenance Costs |  |  |  |  |  |  |  |  |
Turnaround costs |  |  |  |  | $ 2.1 | $ 29.4 | 0.0 | 31.5 | 102.2
Wynnewood refinery |  |  |  |  |  |  |  |  |
Planned Major Maintenance Costs |  |  |  |  |  |  |  |  |
Turnaround costs | $ 43.0 | $ 21.7 | $ 2.7 | $ 13.0 |  |  | $ 80.4 | $ 0.0 | $ 0.0
Minimum | Nitrogen fertilizer plants |  |  |  |  |  |  |  |  |
Planned Major Maintenance Costs |  |  |  |  |  |  |  |  |
Frequency of planned major maintenance activities |  |  |  |  |  |  | 2 years |  |
Minimum | Petroleum refineries |  |  |  |  |  |  |  |  |
Planned Major Maintenance Costs |  |  |  |  |  |  |  |  |
Frequency of planned major maintenance activities |  |  |  |  |  |  | 4 years |  |
Maximum | Nitrogen fertilizer plants |  |  |  |  |  |  |  |  |
Planned Major Maintenance Costs |  |  |  |  |  |  |  |  |
Frequency of planned major maintenance activities |  |  |  |  |  |  | 3 years |  |
Maximum | Petroleum refineries |  |  |  |  |  |  |  |  |
Planned Major Maintenance Costs |  |  |  |  |  |  |  |  |
Frequency of planned major maintenance activities |  |  |  |  |  |  | 5 years |  |

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