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2417409 - Disclosure - Pension Plans and Other Benefits - Fair Value Assumptions (Details)
(http://www.mosaicco.com/role/PensionPlansAndOtherBenefitsFairValueAssumptionsDetails)
TableSchedule of Defined Benefit Plans Disclosures [Table]
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0001285785 (http://www.sec.gov/CIK)
Defined Benefit Plans and Other Postretirement Benefit Plans [Axis]North American Pension Plans
Defined Benefit Plan DisclosurePeriod [Axis]
2016-01-01 - 2016-12-31
2015-01-01 - 2015-12-31
2014-01-01 - 2014-12-31
Defined Benefit Plan, Assumptions Used in Calculations [Abstract]
 
 
 
The assumptions used to determine benefit obligations were as follows:
 
 
 
Discount rate
3.97%  
4.17%  
3.95%  
Expected return on plan assets
5.54%  
5.66%  
6.15%  
Rate of compensation increase
3.50%  
3.50%  
3.50%  
The assumptions used to determine net benefit cost were as follows:
 
 
 
Discount rate
4.17%  
3.95%  
4.75%  
Service cost discount rate
4.19% 1
  
Interest cost discount rate
3.45% 1
  
Expected return on plan assets
5.66%  
6.15%  
6.15%  
Rate of compensation increase
3.50%  
3.50%  
3.50%  
1: In 2016, we changed the method used to estimate the service and interest cost components of net periodic benefit cost for our defined benefit pension and other postretirement benefit plans by electing a full yield curve approach and applying the specific spot rates along the yield curve used in the determination of the benefit obligation to the relevant projected cash flows. The impact of this change to our earnings and earnings per share was not material.