Employee Benefit Plans, Share Based Compensation by Cost and Expense Categories (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Stock Based Compensation Expense Recorded in Cost and Expense Categories
Share-Based Compensation Expense	$ 59.1	$ 60.5	$ 186.0	$ 169.6
Stock Options [Member]
Stock Based Compensation Expense Recorded in Cost and Expense Categories
Share-Based Compensation Expense	14.3	18.8	47.1	58.4
Restricted Stock Units and Performance Share Awards [Member]
Stock Based Compensation Expense Recorded in Cost and Expense Categories
Share-Based Compensation Expense	39.7	35.6	122.3	93.6
Assumed Restricted Stock Units [Member]
Stock Based Compensation Expense Recorded in Cost and Expense Categories
Share-Based Compensation Expense	0.4	0	1.0	0
Employee Stock Purchase Plan [Member]
Stock Based Compensation Expense Recorded in Cost and Expense Categories
Share-Based Compensation Expense	4.7	4.6	15.6	13.2
Other Acquisition Related Compensation [Member]
Stock Based Compensation Expense Recorded in Cost and Expense Categories
Share-Based Compensation Expense	0	1.5	0	4.4
Cost of Revenues, Product [Member]
Stock Based Compensation Expense Recorded in Cost and Expense Categories
Share-Based Compensation Expense	1.2	1.2	3.5	3.4
Cost of Revenues, Service [Member]
Stock Based Compensation Expense Recorded in Cost and Expense Categories
Share-Based Compensation Expense	3.8	3.8	13.2	12.1
Research and Development Expense [Member]
Stock Based Compensation Expense Recorded in Cost and Expense Categories
Share-Based Compensation Expense	26.0	26.5	80.3	75.4
Selling and Marketing Expense [Member]
Stock Based Compensation Expense Recorded in Cost and Expense Categories
Share-Based Compensation Expense	21.4	20.6	64.3	53.0
General and Administrative Expense [Member]
Stock Based Compensation Expense Recorded in Cost and Expense Categories
Share-Based Compensation Expense	$ 6.7	$ 8.4	$ 24.7	$ 25.7