Employee Benefit Plans, Share Based Compensation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Stock Based Compensation Expense Recorded in Cost and Expense Categories
Share-Based Compensation Expense	$ 217.3	$ 240.0	$ 244.6
Stock Options [Member]
Stock Based Compensation Expense Recorded in Cost and Expense Categories
Share-Based Compensation Expense	6.6	14.9	31.5
Unrecognized Compensation Cost	$ 2.1
Weighted Average Period that Unrecognized Compensation Cost Will be Recognized (in years)	7 months 6 days
RSUs, RSAs, and PSAs [Member]
Stock Based Compensation Expense Recorded in Cost and Expense Categories
Share-Based Compensation Expense	$ 197.3	209.7	196.8
Employee Stock Purchase Plan [Member]
Stock Based Compensation Expense Recorded in Cost and Expense Categories
Share-Based Compensation Expense	13.4	15.4	16.3
Restricted Stock Units and Performance Share Awards [Member]
Stock Based Compensation Expense Recorded in Cost and Expense Categories
Unrecognized Compensation Cost	$ 211.2
Weighted Average Period that Unrecognized Compensation Cost Will be Recognized (in years)	1 year 8 months 12 days
Cost of Revenues, Product [Member]
Stock Based Compensation Expense Recorded in Cost and Expense Categories
Share-Based Compensation Expense	$ 5.6	5.0	4.7
Cost of Revenues, Service [Member]
Stock Based Compensation Expense Recorded in Cost and Expense Categories
Share-Based Compensation Expense	13.8	14.2	15.4
Research and Development Expense [Member]
Stock Based Compensation Expense Recorded in Cost and Expense Categories
Share-Based Compensation Expense	125.4	134.5	127.6
Selling and Marketing Expense [Member]
Stock Based Compensation Expense Recorded in Cost and Expense Categories
Share-Based Compensation Expense	45.6	60.2	70.9
General and Administrative Expense [Member]
Stock Based Compensation Expense Recorded in Cost and Expense Categories
Share-Based Compensation Expense	$ 26.9	$ 26.1	$ 26.0