Description of the Business and Summary of Significant Accounting Policies - New Accounting Guidance (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Jan. 01, 2018	Dec. 31, 2014
Segment Reporting Information [Line Items]
Offset of valuation allowance		$ 158.8	$ 119.0
Change in net cash used in investing activities		(414.6)	(228.0)	$ (269.7)
Cost of services	[1]	417.2	396.5	372.7
Inventory carrying value		243.1	242.3
Retained earnings		(2,461.0)	(2,218.7)
Net increase to opening accumulated loss		(199.7)	(333.6)	(222.2)		$ (94.4)
Other components of net benefit costs		(0.3)	(1.4)	(0.5)
WAP Jackpot Payments | Gaming
Segment Reporting Information [Line Items]
Cost of services		23.2	29.8	38.1
Accounting Standards Update 2016-09
Segment Reporting Information [Line Items]
Unrecognized tax benefit			10.1
Offset of valuation allowance			10.1
Accounting Standards Update 2016-18
Segment Reporting Information [Line Items]
Cash, cash equivalents and restricted cash			41.8	38.1		$ 44.0
Change in net cash used in investing activities			$ (3.7)	$ 5.9
Accounting Standards Update 2015-14 | Lottery | Scenario, Forecast
Segment Reporting Information [Line Items]
Net increase to opening accumulated loss					$ (10.0)
Accounting Standards Update 2015-14 | Instant Products Under POS Arrangements | Lottery
Segment Reporting Information [Line Items]
Inventory sales		52.0
Inventory carrying value		33.0
Retained earnings		52.0
Accounting Standards Update 2015-14 | Other Instant Product And Lottery Systems Arrangements | Lottery
Segment Reporting Information [Line Items]
Inventory sales		$ 10.0

[1] Exclusive of D&A.