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Significant Accounting Policies - Amortization (Details)
12 Months Ended
Dec. 31, 2020
Capitalized software | Maximum  
Intangible assets  
Amortization period 3 years
Other intangible assets | Minimum  
Intangible assets  
Amortization period 1 year
Other intangible assets | Maximum  
Intangible assets  
Amortization period 20 years