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2435406 - Disclosure - Retirement and Postretirement Benefits - Weighted Average Assumptions Used in Determining Benefit Obligation and Benefit Cost (Details)
(http://www.timkensteel.com/role/RetirementAndPostretirementBenefitsWeightedAverageAssumptionsUsedInDeterminingBenefitObligationAndBenefitCostDetails)
TableDefined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Table]
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0001598428 (http://www.sec.gov/CIK)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]Period [Axis]
2016-01-01 - 2016-12-31
2015-01-01 - 2015-12-31
Defined Benefit Plans and Other Postretirement Benefit Plans [Axis]Defined Benefit Plans and Other Postretirement Benefit Plans [Axis]
PensionDefined Benefit Plan and Other Postretirement Benefit Plan [Domain]PensionPostretirement
Weighted Average Assumptions Used in Determining Benefit Obligation
 
 
 
 
Discount rate
4.17%  
4.09%  
4.67%  
4.51%  
Future compensation assumption
3.09%  
 
2.76%  
 
Weighted Average Assumptions Used in Determining Benefit Cost
 
 
 
 
Discount rate
4.67%  
4.51%  
4.21%  
4.05%  
Future compensation assumption
3.08%  
 
3.09%  
 
Expected long-term return on plan assets
6.46%  
5.00%  
6.98%  
5.00%