Property and Equipment (Narrative) (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended			9 Months Ended
	Jun. 30, 2015	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Property, Plant and Equipment [Line Items]
Depreciation expense		$ 72.8		$ 58.5	$ 249.1	$ 166.8
Property, plant and equipment, gross		292.3	$ 292.8		292.3
Property, plant and equipment, net		868.4	1,012.8		868.4
Capital lease assets
Property, Plant and Equipment [Line Items]
Accumulated amortization		10.8	5.3		10.8
Gaming equipment
Property, Plant and Equipment [Line Items]
Accumulated amortization		266.4	279.1		266.4
Property, plant and equipment, gross		772.0	799.9		772.0
Property, plant and equipment, net		505.6	520.8		505.6
Gaming | Gaming equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross		59.9			59.9
Gaming | Land and Building
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net		27.5			27.5
Bally Technologies Inc.
Property, Plant and Equipment [Line Items]
Asset impairment charges					7.1
Bally Technologies Inc. | Gaming
Property, Plant and Equipment [Line Items]
Asset impairment charges		$ 0.5			$ 5.7
Bally Technologies Inc. | Gaming | Manufacturing Facility
Property, Plant and Equipment [Line Items]
Asset impairment charges			$ 9.4
Bally Technologies Inc. | Gaming | Sales
Property, Plant and Equipment [Line Items]
Asset impairment charges	$ 4.9