Revenue Recognition - Additional Information (Details) - USD ($) $ in Millions			3 Months Ended			6 Months Ended		12 Months Ended
		Jan. 01, 2018	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2018	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reduction in revenue			$ (844.7)		$ (766.3)	$ (1,656.5)	$ (1,491.7)
Reduction in cost of services			(315.9)		(278.9)	(612.6)	(558.9)
Increase in operating income			99.5		117.3	148.9	205.3
Reduction in inventory			(231.9)			(231.9)			$ (243.1)
Amounts recognized in revenue						37.5
Accounting Standards Update 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase in contract liabilities due to reevaluation of performance obligation		$ 9.7
Reduction of deferred costs due to lack of evidence for price		11.4
AOCI Attributable to Parent | Accounting Standards Update 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net increase (decrease) to accumulated comprehensive loss		$ 10.9
Scenario, Forecast | AOCI Attributable to Parent | Accounting Standards Update 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Expected impact on revenue and operating income for remainder of year, less than								$ 10.0
Instant products
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reduction in revenue			(150.1)		(149.4)	(300.3)	(289.6)
Reduction in cost of services	[1]		(71.3)		(71.3)	(141.0)	(141.4)
Gaming | Gaming operations | Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reduction in revenue			6.5			6.5
Reduction in cost of services			10.9		$ 5.3	10.9	$ 12.4
Lottery | Instant products | Accounting Standards Update 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Amounts recognized in revenue			23.6			57.8
Lottery | Instant products | Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase in instant product revenue				$ 8.1
Increase in operating income				$ 6.3
Increase in contract assets			45.4			45.4			52.0
Reduction in inventory			$ 39.5			$ 39.5			33.0
Lottery | Instant products | AOCI Attributable to Parent | Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net increase (decrease) to accumulated comprehensive loss									$ (19.0)

[1] Exclusive of D&A