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Compensation and Benefits - Restricted Share Activity (Details) - Restricted Stock [Member] - Class of Stock [Domain] - $ / shares
6 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unvested - Weighted Average Grant Date Fair Value $ 51.74 $ 52.59
Unvested - Number of Awards 3,331,169 2,700,634
Granted - Weighted Average Grant Date Fair Value $ 48.17  
Granted - Number of Awards (642,950)  
Forfeited - Weighted Average Grant Date Fair Value $ 52.71  
Forfeited - Number of Awards (12,415)  
Vested - Weighted Average Grant Date Fair Value $ 0.00  
Vested - Number of Awards 0