Litigation - Narrative (Details)			0 Months Ended	1 Months Ended		1 Months Ended		3 Months Ended	12 Months Ended	3 Months Ended
	Mar. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Apr. 16, 2012 Czech Republic Barcrest EUR (€)	Feb. 28, 2015 Czech Republic Barcrest EUR (€)	Apr. 16, 2012 Czech Republic Barcrest EUR (€)	May 31, 2013 Ecosalud USD ($)	May 31, 2013 Ecosalud COP	Mar. 31, 2015 WMS Merger USD ($)	Dec. 31, 2014 Oregon State Lottery Matter USD ($)	Mar. 31, 2015 Guarantee of business revenue USD ($)	Mar. 31, 2015 Performance guarantee USD ($)
Loss Contingencies [Line Items]
Loss contingency accrual	$ 13,800,000	$ 47,300,000
Legal contingencies, liability, estimated range	13,100,000
Loss contingency possible amount of damages										5,000,000.0
Loss contingency deposit of surety bond											4,000,000.0
Litigation settlement, amount				25,000,000		35,200,000	90,000,000,000
Loss contingency, third party erroneous winning jackpot face amount, in excess of			400,000,000.0
Loss contingency, third party loss					1,500,000
Loss contingency, damages sought, value								900,000
Loss contingency, damages claimed, value, in excess of									$ 134,000,000.0