Acquisitions And New Ventures - Final Fair Value of Other Intangible Assets (Details) - Big Fish Games $ in Millions	Dec. 16, 2014 USD ($)
Business Acquisition [Line Items]
Other intangible assets	$ 362.9
Customer Relationships
Business Acquisition [Line Items]
Other intangible assets	$ 32.7
Other intangible assets, weighted average useful lives	2 years 3 months 18 days
Developed Technology
Business Acquisition [Line Items]
Other intangible assets	$ 87.0
Other intangible assets, weighted average useful lives	3 years 10 months 24 days
In-Process Research and Development
Business Acquisition [Line Items]
Other intangible assets	$ 12.7
Other intangible assets, weighted average useful lives	5 years
Strategic Developer Relationships
Business Acquisition [Line Items]
Other intangible assets	$ 30.5
Other intangible assets, weighted average useful lives	4 years 9 months 18 days
Trade Name
Business Acquisition [Line Items]
Other intangible assets	$ 200.0