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Description of Business and Significant Accounting Policies - Revenue Recognition (Details)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Concentration Risk [Line Items]    
Contract term used to recognize set up fees 5 years  
Period of benefit used to amortize set up costs 7 years  
Revenue Benchmark [Member] | Bill and Hold Transactions [Member] | Maximum [Member]    
Concentration Risk [Line Items]    
Concentration Risk, Percentage 1.00% 1.00%