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Chargeback Liability
 12 Months Ended
Dec. 31, 2018
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]  
Chargeback Liability CHARGEBACK LIABILITY
We may be charged back for commissions related to financing, vehicle service, or protection products in the event of early termination, default, or prepayment of the contracts by customers (“chargebacks”). However, our exposure to loss generally is limited to the commissions that we receive. An estimated chargeback liability is recorded in the period in which the related finance and insurance revenue is recognized. The following is a rollforward of our estimated chargeback liability for each of the three years presented in our Consolidated Financial Statements:
 
2018
 
2017
 
2016
Balance - January 1
$
120.8

 
$
116.8

 
$
97.3

Add: Provisions
108.3

 
96.3

 
106.6

Deduct: Chargebacks
(101.0
)
 
(92.3
)
 
(87.1
)
Balance - December 31
$
128.1

 
$
120.8

 
$
116.8