Employee Benefit Plans, Share Based Compensation by Cost and Expense Categories (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Stock Based Compensation Expense Recorded in Cost and Expense Categories
Share-based compensation expense	$ 46.0	$ 60.8
Stock Options [Member]
Stock Based Compensation Expense Recorded in Cost and Expense Categories
Share-based compensation expense	2.2	5.1
RSUs, RSAs, and PSAs [Member]
Stock Based Compensation Expense Recorded in Cost and Expense Categories
Share-based compensation expense	40.6	51.8
ESPP [Member]
Stock Based Compensation Expense Recorded in Cost and Expense Categories
Share-based compensation expense	3.2	3.9
Cost of Revenues, Product [Member]
Stock Based Compensation Expense Recorded in Cost and Expense Categories
Share-based compensation expense	1.7	1.3
Cost of Revenues, Service [Member]
Stock Based Compensation Expense Recorded in Cost and Expense Categories
Share-based compensation expense	3.4	4.0
Research and Development [Member]
Stock Based Compensation Expense Recorded in Cost and Expense Categories
Share-based compensation expense	30.7	32.1
Sales and Marketing [Member]
Stock Based Compensation Expense Recorded in Cost and Expense Categories
Share-based compensation expense	5.8	14.6
General and Administrative [Member]
Stock Based Compensation Expense Recorded in Cost and Expense Categories
Share-based compensation expense	$ 4.4	$ 8.8