Employee Benefit Plans, Share Based Compensation by Share Based Payment Award Types (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
RSUs and PSAs [Member]
Employee Benefit Textuals [Abstract]
Unrecognized Compensation Cost Related to Unvested Stock Options - Adjusted for Forfeitures	$ 342.7
Weighted Average Period that Unrecognized Compensation Cost Will be Recognized (years)	2 years 2 months 12 days
Stock Options [Member]
Employee Benefit Textuals [Abstract]
Unrecognized Compensation Cost Related to Unvested Stock Options - Adjusted for Forfeitures	59.0
Weighted Average Period that Unrecognized Compensation Cost Will be Recognized (years)	2 years 3 months 18 days
RSA [Member]
Employee Benefit Textuals [Abstract]
Unrecognized Compensation Cost Related to Unvested Stock Options - Adjusted for Forfeitures	$ 65.2
Weighted Average Period that Unrecognized Compensation Cost Will be Recognized (years)	3 years 2 months 12 days