Acquisitions (Acquisitions) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
	Nov. 21, 2014	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014	Dec. 31, 2013
Business Acquisition [Line Items]
Goodwill impairment		$ 535.0	$ 0.0	$ 535.0	$ 0.0
Goodwill		3,485.2		3,485.2		$ 4,108.3	$ 1,183.1
Revenue from Consolidated Statements of Operations and Comprehensive Loss		(671.6)	(415.6)	(2,021.8)	(1,220.6)
Net loss from Consolidated Statements of Operations and Comprehensive Loss		(678.2)	(69.8)	(866.8)	(187.2)
WMS Acquisition
Business Acquisition [Line Items]
Purchase price	$ 5,100.0
Goodwill impairment	1,900.0
Add: Bally revenue not reflected in Consolidated Statements of Operations and Comprehensive Loss			320.7		1,018.0
Unaudited pro forma revenue			736.3		2,238.6
Add: Bally net income not reflected in Consolidated Statements of Operations and Comprehensive Loss adjusted by pro forma adjustments (1), (2), (3), (4), (5), and (6) below			(40.7)		(112.9)
Unaudited pro forma net loss			(110.5)		(300.1)
Interactive
Business Acquisition [Line Items]
Goodwill impairment				535.0
Goodwill		2,887.7		$ 2,887.7		$ 3,499.7	$ 612.7
Interactive | WMS Acquisition
Business Acquisition [Line Items]
Goodwill	$ 2,956.1
Depreciation and amortization | WMS Acquisition
Business Acquisition [Line Items]
Unaudited pro forma net loss			(43.0)		(113.2)
Fair Value Adjustment to Inventory [Member] | WMS Acquisition
Business Acquisition [Line Items]
Unaudited pro forma net loss		0.0			5.2
Acquisition-related fees and expenses | WMS Acquisition
Business Acquisition [Line Items]
Unaudited pro forma net loss		(5.6)
Interest expense | WMS Acquisition
Business Acquisition [Line Items]
Unaudited pro forma net loss			(77.5)		(228.6)
Loss on early extinguishment of debt | WMS Acquisition
Business Acquisition [Line Items]
Unaudited pro forma net loss		$ 0.0			(25.9)
Income tax expense | WMS Acquisition
Business Acquisition [Line Items]
Unaudited pro forma net loss			$ 43.6		$ 115.6