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Acquisitions and Dispositions (Acquisitions) (Details) (USD $)	3 Months Ended		0 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Nov. 21, 2014	Dec. 31, 2014	Dec. 31, 2013
Business Acquisition [Line Items]
Goodwill	$ 4,031,000,000us-gaap_Goodwill			$ 4,108,300,000us-gaap_Goodwill	$ 1,183,100,000us-gaap_Goodwill
Revenue from Consolidated Statements of Operations and Comprehensive Loss	(658,700,000)us-gaap_Revenues	(388,100,000)us-gaap_Revenues
Net loss from Consolidated Statements of Operations and Comprehensive Loss	(86,400,000)	(45,000,000)
WMS Acquisition
Business Acquisition [Line Items]
Purchase price			5,100,000,000
Impairments			1,900,000,000
Add: Bally revenue not reflected in Consolidated Statements of Operations and Comprehensive Loss		346,900,000
Unaudited pro forma revenue		735,000,000
Add: Bally net income not reflected in Consolidated Statements of Operations and Comprehensive Loss adjusted by pro forma adjustments (1), (2), (3) and (4) below		(35,600,000)
Unaudited pro forma net loss		(80,600,000)
Interactive
Business Acquisition [Line Items]
Goodwill	3,434,700,000			3,499,700,000	612,700,000
Interactive \| WMS Acquisition
Business Acquisition [Line Items]
Goodwill			2,956,100,000
Depreciation and amortization \| WMS Acquisition
Business Acquisition [Line Items]
Unaudited pro forma net loss		(30,300,000)
Acquisition-related fees and expenses \| WMS Acquisition
Business Acquisition [Line Items]
Unaudited pro forma net loss		2,200,000
Interest expense \| WMS Acquisition
Business Acquisition [Line Items]
Unaudited pro forma net loss		(77,500,000)
Income tax expense \| WMS Acquisition
Business Acquisition [Line Items]
Unaudited pro forma net loss		$ 39,800,000