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Financing Arrangements (Narrative) (Details) - USD ($)
3 Months Ended 9 Months Ended
Apr. 17, 2017
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Dec. 21, 2016
Oct. 21, 2015
Aug. 13, 2015
Line of Credit Facility [Line Items]                  
Percentage ownership 100.00%                
Repayments of term loan       $ 27,700,000 $ 3,400,000        
Loss on extinguishment of debt   $ 0 $ 0 11,000,000 0        
Fees paid for early extinguishment of debt       8,000,000 0        
Payments of financing costs       7,500,000 $ 0        
Debt outstanding   519,300,000   519,300,000   $ 475,000,000      
Southwest Steel Processing LLC | Arkansas Development Finance Authority                  
Line of Credit Facility [Line Items]                  
Maximum borrowing capacity               $ 11,000,000.0  
Amount drawn   5,600,000   5,600,000          
Machinery and Equipment                  
Line of Credit Facility [Line Items]                  
Capital lease obligations   $ 18,900,000   $ 18,900,000          
Maximum                  
Line of Credit Facility [Line Items]                  
Capital lease obligations                 $ 50,000,000.0
Revolving credit                  
Line of Credit Facility [Line Items]                  
Stated interest rate   3.08%   3.08%          
Debt outstanding   $ 100,300,000   $ 100,300,000   132,800,000      
Foreign Line of Credit                  
Line of Credit Facility [Line Items]                  
Stated interest rate   3.25%   3.25%          
Debt outstanding   $ 28,000,000   $ 28,000,000   26,400,000      
Senior Notes                  
Line of Credit Facility [Line Items]                  
Stated interest rate 8.125% 8.125%   8.125%          
Repayments of term loan $ 250,000,000                
Debt outstanding   $ 0   $ 0   $ 250,000,000      
Line of Credit | Foreign Line of Credit | Banco Bolbao Vizcaya Argentaria, S.A.                  
Line of Credit Facility [Line Items]                  
Maximum borrowing capacity             $ 28,000,000    
Seventh Amendment Credit Agreement | Revolving credit                  
Line of Credit Facility [Line Items]                  
Maximum borrowing capacity 350,000,000.0                
Increase in additional borrowing capacity 100,000,000.0                
Senior Notes Due 2021 And Seventh Amendment To Credit Facility                  
Line of Credit Facility [Line Items]                  
Loss on extinguishment of debt 11,000,000                
Fees paid for early extinguishment of debt 8,000,000                
Write-off of unamortized prior debt issuance costs 2,500,000                
Payments of financing costs 500,000                
Financing Agreement | Line of Credit | Revolving credit | Banco Bolbao Vizcaya Argentaria, S.A.                  
Line of Credit Facility [Line Items]                  
Maximum borrowing capacity             $ 11,800,000.0    
Amount drawn   $ 0   $ 0          
Park-Ohio Industries, Inc. | Senior Notes Due 2027 | Senior Notes                  
Line of Credit Facility [Line Items]                  
Aggregate principal amount $ 350,000,000.0                
Stated interest rate 6.625%