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2414410 - Disclosure - Employee Benefit Plans (Details 8)
(http://www.calumetspecialty.com/role/EmployeeBenefitPlansDetails8)
TableSchedule of Defined Benefit Plans Disclosures [Table]
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0001340122 (http://www.sec.gov/CIK)
Defined Benefit Plans and Other Postretirement Benefit Plans [Axis]Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]Period [Axis]
2016-01-01 - 2016-12-31
2015-01-01 - 2015-12-31
2014-01-01 - 2014-12-31
Plan Name [Axis]Plan Name [Axis]Plan Name [Axis]
Penreco PlanSuperior PlanMontana PlanPenreco PlanSuperior PlanMontana PlanPenreco PlanSuperior PlanMontana Plan
Significant Weighted Average Assumptions Used to Determine the Benefit Obligations
 
 
 
 
 
 
 
 
 
Discount rate
4.08%  
4.06%  
4.04%  
4.30%  
4.27%  
4.21%  
   
Significant Weighted Average Assumptions Used to Determine Net Periodic Benefit Cost
 
 
 
 
 
 
 
 
 
Discount rate
4.30%  
4.27%  
4.21%  
3.92%  
3.86%  
4.13%  
4.78%  
4.66%  
4.97%  
Expected return on plan assets
6.75% 1
6.75% 1
6.75% 1
6.75% 1
6.75% 1
6.75% 1
6.75% 1
6.75% 1
6.75% 1
Rate of compensation increase
     
3.00%  
  
3.00%  
1: (1) The Company considered the historical returns, the future expectation for returns for each asset class and fair value of the plan assets, as well as the target asset allocation of the Pension Plan portfolio which was developed in accordance with the Company’s Statement of Investment Policy, to develop the expected long-term rate of return on plan assets.