Income and Other Taxes - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Jul. 18, 2016	Dec. 31, 2013
Income Taxes [Line Items]
Unrecognized tax benefits	$ 3.1	$ 2.5	$ 2.9		$ 0.6
Unrecognized tax benefits, income tax penalties and interest accrued (less than)	0.1
Unrecognized tax benefits that would impact effective tax rate	2.6
Anticipated decrease in unrecognized tax positions	0.8
Selling, general and administrative expense	100.2	$ 90.8	$ 76.0
Tax contingency, civial penalty and interest estimate				$ 1.6
Big Fish Games
Income Taxes [Line Items]
Unrecognized tax benefits	1.0
Federal | Youbet.com
Income Taxes [Line Items]
Operating loss carryforwards	5.1
State
Income Taxes [Line Items]
Operating loss carryforwards	1.6
Operating loss carryforwards, valuation allowance	0.2
State | Youbet.com and Big Fish Games
Income Taxes [Line Items]
Operating loss carryforwards	0.8
Accrued Liabilities
Income Taxes [Line Items]
Selling, general and administrative expense	$ 1.5