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Stock-Based Compensation - Narrative (Details)
12 Months Ended
Dec. 16, 2020
USD ($)
$ / shares
shares
May 06, 2020
USD ($)
shares
Apr. 28, 2016
shares
Dec. 31, 2020
USD ($)
$ / shares
shares
Dec. 31, 2019
USD ($)
$ / shares
Dec. 31, 2018
USD ($)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Stock options exercised       0    
Stock-based compensation expense | $       $ 6,600,000 $ 7,400,000 $ 7,300,000
Future stock-based compensation expense | $       $ 6,100,000    
Future stock-based compensation expense, period of recognition       1 year 6 months    
Time-Based Restricted Stock Units            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Vesting rights description       These restricted stock units do not have any performance conditions for vesting.    
Weighted average grant date fair value | $ / shares       $ 7.62 $ 11.89  
Performance-Based Restricted Stock Units            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Vesting rights description       The overall vesting period is generally three years, with relative total shareholder return measured for the one, two and three-year periods creating effectively a “nested” 1-year, 2-year, and 3-year plan to support rapid and sustained shareholder value creation.    
Vesting period       3 years    
Number of trading days to calculate average closing stock price       20 days    
Weighted average grant date fair value | $ / shares       $ 4.98 $ 0  
Restricted Stock Units, Settled in Cash            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Share-based compensation, maximum grant value | $       $ 0 $ 0  
Stock-based compensation arrangements, liability, noncurrent | $       $ 100,000 $ 100,000  
President and Chief Executive Officer            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Future stock-based compensation expense | $ $ 4,600,000          
Future stock-based compensation expense, period of recognition 3 years          
President and Chief Executive Officer | Time-Based Restricted Stock Units            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Number of shares authorized (in shares) 423,400          
Weighted average grant date fair value | $ / shares $ 5.17          
President and Chief Executive Officer | Performance-Based Restricted Stock Units            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Number of shares authorized (in shares) 423,400          
Weighted average grant date fair value | $ / shares $ 5.68          
President and Chief Executive Officer | Maximum | Performance-Based Restricted Stock Units            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Number of shares authorized (in shares) 635,100          
TimkenSteel 2014 Plan            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Number of additional shares authorized (in shares)     0      
TimkenSteel 2014 Plan | Maximum            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Number of shares authorized (in shares)     11,050,000.00      
Aggregate share limit ratio     2.50      
TimkenSteel 2014 Plan | Current Holders of Timken Equity Awards at Time of Spinoff | Maximum            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Number of shares authorized (in shares)     3,000,000.0      
TimkenSteel 2020 Plan            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Aggregate share limit ratio   1        
Shares available for grant (in shares)   2,000,000.0   2,200,000    
TimkenSteel 2020 Plan | Maximum            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Number of shares authorized (in shares)   2,000,000.0        
TimkenSteel 2020 Plan | Non-employee Director | Maximum            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Share-based compensation, maximum grant value | $   $ 500,000