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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2017
Accounting Policies [Abstract] |
Schedule of lives used in computing depreciation for depreciable assets | The lives used in computing depreciation for such assets are as follows:
Asset | Range of Useful Lives, in Years
Improvements to land | 15 to 30
Buildings | 20 to 30
Machinery and equipment | 5 to 30
Automotive equipment | 5 to 15
Furniture and fixtures | 3 to 10
Aircraft | 20
Railcars | 25 to 30
Property, plant and equipment consisted of the following:
| December 31,
| 2017 |  | 2016
| (in millions)
Land and improvements | $ | 47.4 |  |  | $ | 46.5 |
Buildings | 83.3 |  |  | 64.8 |
Machinery and equipment | 3,733.8 |  |  | 3,656.5 |
Automotive equipment | 24.7 |  |  | 24.7 |
Furniture and fixtures | 32.4 |  |  | 28.9 |
Leasehold improvements | 4.6 |  |  | 3.6 |
Aircraft | 3.6 |  |  | 3.6 |
Railcars | 16.8 |  |  | 16.8 |
Construction in progress | 56.2 |  |  | 54.2 |
| 4,002.8 |  |  | 3,899.6 |
Less: Accumulated depreciation | 1,431.0 |  |  | 1,227.5 |
Total Property, plant and equipment, net | $ | 2,571.8 |  |  | $ | 2,672.1 |
Schedule of planned major maintenance activity | For the years ended December 31, 2017, 2016 and 2015, the Company's petroleum and nitrogen fertilizer segments incurred the following major scheduled turnaround expenses.
| For the Year Ended December 31,
| 2017 |  | 2016 |  | 2015
| (in millions)
Petroleum segment |  |  |  |  |
Coffeyville refinery(1) | $ | — |  |  | $ | 31.5 |  |  | $ | 102.2 |
Wynnewood refinery(2) | 80.4 |  |  | — |  |  | — |
Nitrogen Fertilizer segment |  |  |  |  |
Nitrogen Fertilizer plants(3) | 2.6 |  |  | 6.6 |  |  | 7.0 |
Total Major Scheduled Turnaround Expenses | $ | 83.0 |  |  | $ | 38.1 |  |  | $ | 109.2 |
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(1) | The Coffeyville refinery completed the first phase of its most recent major scheduled turnaround in November 2015. The second phase of the Coffeyville turnaround was completed during the first quarter of 2016.
(2) | The Wynnewood refinery completed the first phase of its most recent major scheduled turnaround in November 2017. The second phase of the Wynnewood turnaround is expected to occur in 2019. In addition to the two phase turnaround, the petroleum business accelerated certain planned turnaround activities in the first quarter of 2017 on the hydrocracker unit for a catalyst change-out. The petroleum business incurred approximately $13.0 million of major scheduled turnaround expenses for the hydrocracker.
(3) | The Nitrogen Fertilizer Partnership underwent a full facility turnaround at the Coffeyville fertilizer facility in the third quarter of 2015. During the second quarter of 2016 and the third quarter of 2017, the East Dubuque Facility completed major scheduled turnarounds.

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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