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