Revenue Recognition (Tables)

12 Months Ended

Dec. 31, 2018

Revenue from Contract with Customer [Abstract]

Summary of Revenue by Type Within Each Business Segment

The following table disaggregates our revenues by type within each of our business segments:

	Revenue recognized for Year Ended December 31,
Revenue category	2018		2017		2016
Gaming
Gaming operations	$	631.9	$	696.0	$	725.3
Gaming machine sales	646.3		672.4		618.2
Gaming systems	320.6		274.0		240.8
Table products	232.6		201.9		188.4
Total	$	1,831.4	$	1,844.3	$	1,772.7
Lottery
Instant products	$	592.5	$	588.0	$	573.7
Lottery systems	253.8		223.5		204.2
Total	$	846.3	$	811.5	$	777.9
Social
Mobile	$	322.9	$	259.6	$	187.1
Web and other	93.0		102.4		87.3
Total	$	415.9	$	362.0	$	274.4
Digital
Sports and platform	$	100.5	$	—	$	—
Gaming and other	169.1		65.8		58.4
Total	$	269.6	$	65.8	$	58.4

Summary of Contract Liabilities

The following table summarizes our opening and closing balances in these accounts (other than contract liabilities disclosed above):

	Receivables		Contract Assets(1)
Opening balance, January 1, 2018	$	724.7	$	66.4
Closing balance, December 31, 2018	753.3		113.7
(1) Contract assets are included primarily within Prepaid expenses, deposits and other current assets in our December 31, 2018 consolidated balance sheet.

The following table summarizes the activity in our contract liabilities for the reporting period:

	Year Ended December 31, 2018
Contract liability balance, beginning of period(1)	$	88.2
Liabilities recognized during the period	53.7
Amounts recognized in revenue from beginning balance	(44.8		)
Contract liability balance, end of period(1)	$	97.1
(1) Contract liabilities are included within accrued liabilities and other long-term liabilities in our consolidated balance sheet.