Revenue Recognition (Tables)

6 Months Ended

Jun. 30, 2018

Revenue from Contract with Customer [Abstract]

Summary of Revenues by Type

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

	Three Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018		2017
Gaming
Gaming operations	$	159.9	$	178.4	$	321.3	$	350.8
Gaming machine sales	167.6		163.3		312.4		319.5
Gaming systems	84.3		67.1		159.3		128.6
Table products	58.9		48.4		120.7		98.3
Total	$	470.7	$	457.2	$	913.7	$	897.2
Lottery
Instant products	$	150.1	$	151.3	$	300.3	$	293.0
Lottery systems	57.0		51.0		108.5		98.4
Total	$	207.1	$	202.3	$	408.8	$	391.4
Social
Social gaming	$	99.7	$	91.1	$	197.1	$	171.3
Total	$	99.7	$	91.1	$	197.1	$	171.3
Digital
Sports and platform	$	20.5	$	—	$	46.4	$	—
Gaming and other	46.7		15.7		90.5		31.8
Total	$	67.2	$	15.7	$	136.9	$	31.8

Summary of Contract Liabilities

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

	Six Months Ended June 30,
	2018
Contract liability balance, beginning of period(1)	$	88.2
Liabilities recognized during the period	46.9
Amounts recognized in revenue from beginning balance	(37.5		)
Contract liability balance, end of period(1)	$	97.6
(1) Contract liabilities are included within accrued liabilities and other long-term liabilities in our consolidated balance sheet.

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, June 30, 2018	733.8		90.6
(1) Contract assets are included primarily within Prepaid expenses, deposits and other current assets in our June 30, 2018 consolidated balance sheet.