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Employee Stock-Based Compensation and Benefit Plans (Schedule of Non-vested Stock Unit Activity) (Details) - Non-vested stock - $ / shares
1 Months Ended 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2015
Number of Shares        
Non-vested stock units at December 31, 2013 (in shares)       5,037,295
Granted (in shares)       3,415,207
Assumed from acquisitions (in shares)       142,822
Vested (in shares)       (1,971,312)
Forfeited (in shares)       (1,476,086)
Non-vested stock units at December 31, 2014 (in shares)       5,147,926
Weighted- Average Fair Value at Grant Date        
Non-vested stock units at December 31, 2013 (in dollars per share)       $ 66.20
Granted (in dollars per share) $ 61.01 $ 56.94 $ 89.93 66.70
Assumed (in dollars per share)       64.78
Vested (in dollars per share)       64.10
Forfeited (in dollars per share)       69.38
Non-vested stock units at December 31, 2014 (in dollars per share)       $ 65.00