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Business and Summary of Significant Accounting Policies - Deferred Commissions (Details)
Dec. 31, 2019
Perpetual license and maintenance revenue  
Capitalized Contract Cost [Line Items]  
Estimated period of benefit 5 years
Minimum | Subscription revenue  
Capitalized Contract Cost [Line Items]  
Estimated period of benefit 3 years
Maximum | Subscription revenue  
Capitalized Contract Cost [Line Items]  
Estimated period of benefit 4 years