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Chargeback Liability (Tables)
 12 Months Ended
Dec. 31, 2016
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:
 
2016
 
2015
 
2014
Balance - January 1
$
97.3

 
$
84.9

 
$
67.6

Add: Provisions
106.6

 
90.0

 
79.4

Deduct: Chargebacks
(87.1
)
 
(77.6
)
 
(62.1
)
Balance - December 31
$
116.8

 
$
97.3

 
$
84.9