Compensation and Benefits - Restricted Share Activity (Details)	9 Months Ended
	Sep. 30, 2021 $ / shares shares
Restricted Stock
Weighted-Average Grant Date Fair Value
Beginning balance (in dollars per share) | $ / shares	$ 35.09
Granted (in dollars per share) | $ / shares	52.93
Forfeited (in dollars per share) | $ / shares	29.85
Vested (in dollars per share) | $ / shares	31.53
Ending balance (in dollars per share) | $ / shares	$ 38.17
Restricted Stock Awards and Restricted Stock Units
Beginning balance (in shares) | shares	5,293,642
Granted (in shares) | shares	741,555
Forfeited (in shares) | shares	(98,197)
Vested (in shares) | shares	(685,178)
Ending balance (in shares) | shares	5,251,822
Performance Shares
Weighted-Average Grant Date Fair Value
Beginning balance (in dollars per share) | $ / shares	$ 52.45
Granted (in dollars per share) | $ / shares	68.58
Forfeited (in dollars per share) | $ / shares	0
Vested (in dollars per share) | $ / shares	0
Ending balance (in dollars per share) | $ / shares	$ 61.42
Restricted Stock Awards and Restricted Stock Units
Beginning balance (in shares) | shares	60,000
Granted (in shares) | shares	75,230
Forfeited (in shares) | shares	0
Vested (in shares) | shares	0
Ending balance (in shares) | shares	135,230