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Significant Accounting Policies (Narrative) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2020
USD ($)
customer
entity
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Significant Accounting Policies [Line Items]      
Number of legal entities consolidated | entity 5    
Expenditures for company-sponsored research and development activities | $ $ 35.6 $ 41.0 $ 40.1
Number of customers representing greater than 10% of net sales or accounts receivable | customer 0    
Percentage of net sales or accounts receivable to be considered a major customer 10.00%    
Minimum [Member] | Software and Software Development Costs [Member]      
Significant Accounting Policies [Line Items]      
Property, plant and equipment, useful lives 1 year    
Minimum [Member] | Five Entities [Member]      
Significant Accounting Policies [Line Items]      
Non-controlling interest ownerships in consolidated entities 5.00%    
Maximum [Member] | Software and Software Development Costs [Member]      
Significant Accounting Policies [Line Items]      
Property, plant and equipment, useful lives 10 years    
Maximum [Member] | Five Entities [Member]      
Significant Accounting Policies [Line Items]      
Non-controlling interest ownerships in consolidated entities 41.00%