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Summary of Significant Accounting Policies (Narrative) (Details)
 12 Months Ended
Dec. 31, 2020
Summary Of Significant Accounting Policies [Line Items]  
Change In Accounting Principle Accounting Standards Update Adopted true
Change In Accounting Principle Accounting Standards Update Adoption Date Jan. 01, 2020
Change In Accounting Principle Accounting Standards Update Immaterial Effect true
Accounting Standards Update Extensible List us-gaap:AccountingStandardsUpdate201613Member
Maximum [Member]  
Summary Of Significant Accounting Policies [Line Items]  
Intangible assets, useful life 20 years
Long-lived asset estimated remaining useful life 25 years
Maximum [Member] | Equipment and Buildings [Member]  
Summary Of Significant Accounting Policies [Line Items]  
Useful Life 25 years
Maximum [Member] | Software Development [Member]  
Summary Of Significant Accounting Policies [Line Items]  
Useful Life 7 years
Minimum [Member]  
Summary Of Significant Accounting Policies [Line Items]  
Intangible assets, useful life 5 years
Long-lived asset estimated remaining useful life 2 years
Minimum [Member] | Equipment and Buildings [Member]  
Summary Of Significant Accounting Policies [Line Items]  
Useful Life 15 years
Minimum [Member] | Software Development [Member]  
Summary Of Significant Accounting Policies [Line Items]  
Useful Life 5 years
Consolidated Subsidiaries [Member] | Maximum [Member]  
Summary Of Significant Accounting Policies [Line Items]  
Voting stock ownership percentage 50.00%
Consolidated Subsidiaries [Member] | Minimum [Member]  
Summary Of Significant Accounting Policies [Line Items]  
Voting stock ownership percentage 20.00%
Consolidated Subsidiaries [Member] | Outside Shareholders [Member] | Maximum [Member]  
Summary Of Significant Accounting Policies [Line Items]  
Non controlling interests, ownership percentage by parent 100.00%