Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2017

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.