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Chargeback Liability (Tables)
12 Months Ended
Dec. 31, 2020
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]  
Rollforward of Estimated Chargeback Liability The following is a rollforward of our estimated chargeback liability for each of the three years presented in our Consolidated Financial Statements:
202020192018
Balance - January 1$134.5 $128.1 $120.8 
Add: Provisions118.1 108.6 108.3 
Deduct: Chargebacks(110.5)(102.2)(101.0)
Balance - December 31$142.1 $134.5 $128.1