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Chargeback Liability (Tables)
 12 Months Ended
Dec. 31, 2019
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:
 
2019
 
2018
 
2017
Balance - January 1
$
128.1

 
$
120.8

 
$
116.8

Add: Provisions
108.6

 
108.3

 
96.3

Deduct: Chargebacks
(102.2
)
 
(101.0
)
 
(92.3
)
Balance - December 31
$
134.5

 
$
128.1

 
$
120.8