Employee Benefit Plans, Share Based Compensation by Share Based Payment Award Types (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2013
Stock Options [Member]
Unrecognized Compensation Cost [Abstract]
Unrecognized Compensation Cost Related to Unvested Stock Options - Adjusted for Forfeitures	$ 50.0
Weighted Average Period that Unrecognized Compensation Cost Will be Recognized (years)	2 years 2 months 12 days
RSUs, RSAs, and PSAs [Member]
Unrecognized Compensation Cost [Abstract]
Unrecognized Compensation Cost Related to Unvested Stock Options - Adjusted for Forfeitures	$ 354.4
Weighted Average Period that Unrecognized Compensation Cost Will be Recognized (years)	2 years 2 months 12 days