Annual report pursuant to Section 13 and 15(d)

Short-Term Borrowings and Credit Lines (Narrative) (Details)

v3.20.4
Short-Term Borrowings and Credit Lines (Narrative) (Details)
 12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2020
CAD ($)
Dec. 31, 2020
EUR (€)
Dec. 31, 2020
JPY (¥)
Dec. 31, 2020
CNY (¥)
Domestic [Member] | Unsecured And Uncommitted Line Of Credit [Member]          
Line of Credit Facility [Line Items]          
Maximum borrowing capacity $ 500,000,000.0        
Canadian Subsidiary [Member] | Unsecured And Uncommitted Line Of Credit [Member]          
Line of Credit Facility [Line Items]          
Maximum borrowing capacity $ 23,500,000 $ 30,000,000.0      
Interest rate description Canadian prime rate        
European Subsidiary [Member] | Unsecured And Uncommitted Line Of Credit [Member]          
Line of Credit Facility [Line Items]          
Maximum borrowing capacity $ 37,900,000        
European Subsidiary [Member] | Unsecured And Uncommitted Credit Line1 [Member]          
Line of Credit Facility [Line Items]          
Maximum borrowing capacity | €     € 25,800,000    
European Subsidiary [Member] | Unsecured And Uncommitted Credit Line2 [Member]          
Line of Credit Facility [Line Items]          
Maximum borrowing capacity | €     600,000    
European Subsidiary [Member] | Committed Line Of Credit [Member]          
Line of Credit Facility [Line Items]          
Maximum borrowing capacity | €     € 4,400,000    
Japanese Subsidiary [Member] | Unsecured And Uncommitted Line Of Credit [Member]          
Line of Credit Facility [Line Items]          
Maximum borrowing capacity 21,500,000        
Japanese Subsidiary [Member] | Unsecured And Uncommitted Credit Line1 [Member]          
Line of Credit Facility [Line Items]          
Maximum borrowing capacity 7,000,000.0        
Japanese Subsidiary [Member] | Unsecured And Uncommitted Credit Line2 [Member]          
Line of Credit Facility [Line Items]          
Maximum borrowing capacity | ¥       ¥ 1,500,000,000  
Korean Subsidiary [Member] | Unsecured And Uncommitted Line Of Credit [Member]          
Line of Credit Facility [Line Items]          
Maximum borrowing capacity 20,000,000.0        
China Subsidiary [Member] | Unsecured And Uncommitted Line Of Credit [Member]          
Line of Credit Facility [Line Items]          
Maximum borrowing capacity 41,500,000        
China Subsidiary [Member] | Unsecured And Uncommitted Credit Line1 [Member]          
Line of Credit Facility [Line Items]          
Maximum borrowing capacity $ 20,000,000.0        
Unsecured And Uncommitted Line Of Credit [Member] | China Subsidiary [Member]          
Line of Credit Facility [Line Items]          
Maximum borrowing capacity | ¥         ¥ 140,000,000.0
Maximum | European Subsidiary [Member] | European Central Bank Refinancing Rate [Member] | Revolving Line Of Credit [Member]          
Line of Credit Facility [Line Items]          
Basis points 1.85% 1.85% 1.85% 1.85% 1.85%
Maximum | European Subsidiary [Member] | Euro Overnight Index Average [Member] | Revolving Line Of Credit [Member]          
Line of Credit Facility [Line Items]          
Basis points 0.75% 0.75% 0.75% 0.75% 0.75%