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Financing Arrangements (Narrative) (Details) - USD ($)
12 Months Ended
Dec. 31, 2017
Jun. 30, 2019
Dec. 31, 2018
Dec. 31, 2015
Line of Credit Facility [Line Items]        
Percentage ownership 100.00%      
Total debt   $ 595,300,000 $ 573,100,000  
Southwest Steel Processing LLC | Arkansas Development Finance Authority        
Line of Credit Facility [Line Items]        
Maximum borrowing capacity       $ 11,000,000.0
Amount drawn   8,900,000    
Machinery and Equipment        
Line of Credit Facility [Line Items]        
Capital lease obligations   $ 17,500,000    
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   3.62%    
Total debt   $ 192,700,000 165,100,000  
Foreign Line of Credit        
Line of Credit Facility [Line Items]        
Stated interest rate   3.25%    
Total debt   $ 8,300,000 12,600,000  
Foreign Line of Credit | Line of Credit | Banco Bolbao Vizcaya Argentaria, S.A.        
Line of Credit Facility [Line Items]        
Maximum borrowing capacity   25,500,000.0    
Financing Agreement | Revolving credit | Line of Credit | Banco Bolbao Vizcaya Argentaria, S.A.        
Line of Credit Facility [Line Items]        
Maximum borrowing capacity   11,300,000.0    
Amount drawn   0    
Park-Ohio Industries, Inc. | Seventh Amendment Credit Agreement | Revolving credit        
Line of Credit Facility [Line Items]        
Maximum borrowing capacity $ 350,000,000.0      
Park-Ohio Industries, Inc. | Seventh Amendment Credit Agreement | Revolving Credit Facility Canadian Sub-Limit        
Line of Credit Facility [Line Items]        
Maximum borrowing capacity 35,000,000.0      
Park-Ohio Industries, Inc. | Seventh Amendment Credit Agreement | Revolving Credit Facility European Sub-Limit        
Line of Credit Facility [Line Items]        
Maximum borrowing capacity 25,000,000.0      
Park-Ohio Industries, Inc. | Amendment No. 1 to Seventh Amended and Restated Credit Agreement | Revolving credit        
Line of Credit Facility [Line Items]        
Maximum borrowing capacity     375,000,000.0  
Increase in additional borrowing capacity   100,000,000.0    
Bank guarantees outstanding   $ 31,000,000 27,500,000  
Park-Ohio Industries, Inc. | Amendment No. 1 to Seventh Amended and Restated Credit Agreement | Revolving Credit Facility Canadian Sub-Limit        
Line of Credit Facility [Line Items]        
Maximum borrowing capacity     40,000,000.0  
Park-Ohio Industries, Inc. | Amendment No. 1 to Seventh Amended and Restated Credit Agreement | Revolving Credit Facility European Sub-Limit        
Line of Credit Facility [Line Items]        
Maximum borrowing capacity     $ 30,000,000.0  
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%