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Financing Arrangements (Narrative) (Details) - USD ($)
1 Months Ended
Apr. 30, 2017
Mar. 31, 2019
Dec. 31, 2018
Jun. 30, 2018
Apr. 17, 2017
Oct. 31, 2015
Aug. 31, 2015
Line of Credit Facility [Line Items]              
Percentage ownership 100.00%            
Total debt   $ 571,300,000 $ 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   8,600,000          
Machinery and Equipment              
Line of Credit Facility [Line Items]              
Capital lease obligations   $ 19,100,000          
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   3.67%          
Total debt   $ 166,600,000 165,100,000        
Foreign Line of Credit              
Line of Credit Facility [Line Items]              
Stated interest rate   3.25%          
Total debt   $ 11,000,000 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   25,200,000.0          
Financing Agreement | Revolving credit | Line of Credit | Banco Bolbao Vizcaya Argentaria, S.A.              
Line of Credit Facility [Line Items]              
Maximum borrowing capacity   11,200,000.0          
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   $ 28,500,000 $ 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%