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Software - Narrative (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended			3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2013
Business Acquisition [Line Items]
Capitalized computer software, amortization	$ 95.7	$ 39.6	$ 28.0
Asset impairment charge			3.1us-gaap_AssetImpairmentCharges
Gaming
Business Acquisition [Line Items]
Restructuring, accelerated depreciation expense	3.8	8.0
Asset impairment charge		3.4
Bally Technologies Inc.
Business Acquisition [Line Items]
Capitalized computer software, additions				308.3
Restructuring, accelerated depreciation expense	14.5
WMS Acquisition
Business Acquisition [Line Items]
Capitalized computer software, additions					257.8
Integrating Scientific Games and WMS \| WMS Acquisition
Business Acquisition [Line Items]
Restructuring, accelerated depreciation expense		4.6			4.6
Intellectual property \| WMS Acquisition
Business Acquisition [Line Items]
Capitalized computer software, additions					201.2
Internal use software
Business Acquisition [Line Items]
Capitalized computer software, additions	$ 47.9	$ 37.9