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Revenue Recognition (Tables)
 12 Months Ended
Dec. 31, 2017
Revenue Recognition [Abstract]  
Summary of Revenue by Type Within Each Business Segment
The following table provides a disaggregated view of our revenues based on the type of revenue within each of our business segments:
 
Revenue recognized for Year Ended December 31,
Revenue category
2017
 
2016
 
2015
Gaming
 
 
 
 
 
  Gaming operations
$
696.0

 
$
725.3

 
$
763.2

  Gaming machine sales
672.4

 
618.2

 
571.1

Gaming systems(1)
274.0

 
240.8

 
273.0

  Table products(1)
201.9

 
188.4

 
166.3

    Total
$
1,844.3

 
$
1,772.7

 
$
1,773.6

 
 
 
 
 
 
Lottery
 
 
 
 
 
  Instant products
$
588.0

 
$
573.7

 
$
557.2

  Lottery systems
223.5

 
204.2

 
218.0

    Total
$
811.5

 
$
777.9

 
$
775.2

 
 
 
 
 
 
Interactive
 
 
 
 
 
  Social B2C
$
362.0

 
$
274.4

 
$
170.6

  Other
65.8

 
58.4

 
39.4

    Total
$
427.8

 
$
332.8

 
$
210.0

(1) See General revenue recognition policy below.
Summary of Deferred Revenue Activity
The following table summarizes the deferred revenue activity for the reporting period:
 
Year Ended December 31,
 
2017
 
2016
 
2015
Deferred revenue balance, beginning of period
$
67.4

 
$
57.8

 
$
59.0

New deferrals
205.6

 
200.6

 
252.0

Amounts recognized in revenue
(217.6
)
 
(191.0
)
 
(253.2
)
Deferred revenue balance, end of period
$
55.4

 
$
67.4

 
$
57.8