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Compensation and Benefits - Restricted Share Activity (Details)	3 Months Ended
	Mar. 31, 2021 $ / shares shares
Restricted Stock Awards
Restricted Stock Awards and Restricted Stock Units
Granted (in shares)	740,249
Restricted Stock Units RSUs
Restricted Stock Awards and Restricted Stock Units
Granted (in shares)	1,306
Performance Shares
Restricted Stock Awards and Restricted Stock Units
Beginning balance (in shares)	60,000
Granted (in shares)	75,230
Forfeited (in shares)	0
Vested (in shares)	0
Ending balance (in shares)	135,230
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
Restricted Stock Awards and Restricted Stock Units
Beginning balance (in shares)	5,293,642
Granted (in shares)	741,555
Forfeited (in shares)	0
Vested (in shares)	(627,816)
Ending balance (in shares)	5,407,381
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	0
Vested (in dollars per share) | $ / shares	31.34
Ending balance (in dollars per share) | $ / shares	$ 37.97

X

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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