Description of the Business and Summary of Significant Accounting Policies - Deferred Installation Costs (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Deferred installation costs, net of accumulated depreciation	$ 34.0	$ 39.3
Lottery and other machinery and equipment
Property, Plant and Equipment [Line Items]
Deferred installation costs, net of accumulated depreciation	33.4	30.6
Gaming operations equipment
Property, Plant and Equipment [Line Items]
Deferred installation costs, net of accumulated depreciation	$ 0.6	$ 1.9