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Stock-Based Compensation - Narrative (Details)
$ in Millions
12 Months Ended
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Apr. 28, 2016
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Intrinsic value of options exercised $ 0.1      
Cash proceeds from options exercised 0.2 $ 0.2 $ 0.0  
Tax benefit from option exercises 0.1      
Stock Option Awards and Stock-Settled Restricted Share Awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense 7.3 6.5 6.7  
Stock-based compensation expense, net of tax 7.3 6.5 $ 4.2  
Unrecognized compensation cost $ 8.9      
Unrecognized compensation cost, period for recognition 1 year 6 months      
Restricted Shares and Restricted Stock Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period 3 years      
Vesting increment 25.00%      
Restricted Stock Units, Settled in Cash        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense $ 0.8 0.7    
Payments for cash-settled awards $ 0.1 $ 0.5    
TimkenSteel 2014 Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares authorized (in shares) | shares       11,050,000.00
Aggregate share limit ratio       2.50
Shares available for grant (in shares) | shares 4,200,000      
Current Holders of Timken Equity Awards at Time of Spinoff | TimkenSteel 2014 Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares authorized (in shares) | shares       3,000,000.0