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Description of the Business and Summary of Significant Accounting Policies - New Accounting Guidance (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Product Information [Line Items]
Cost of services	$ 105.5	$ 98.0	$ 307.7	$ 294.3
Retained earnings	(2,417.9)		(2,417.9)		$ (2,218.7)
WAP Jackpot Payments \| Gaming
Product Information [Line Items]
Cost of services	$ 5.5	$ 6.1	$ 17.9	$ 22.9
Instant Products Under POS Arrangements \| Accounting Standards Update 2015-14 \| Lottery
Product Information [Line Items]
Inventory sales					55.0
Retained earnings					55.0
Other Instant Product and Lottery Systems Arrangements \| Accounting Standards Update 2015-14 \| Lottery
Product Information [Line Items]
Inventory sales					$ 12.0