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Stockholders' Equity - Schedule of Restricted, Revest, and Performance Shares (Details) - $ / shares	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
RSUs
Number of Shares
Beginning balance (in shares)	4,520,000
Granted (in shares)	1,890,000
Vested (in shares)	(1,463,000)
Cancelled/forfeited (in shares)	(470,000)
Ending balance (in shares)	4,477,000	4,520,000
Weighted-Average  Grant Date Fair Value Per Share
Beginning balance (in USD per share)	$ 30.01
Granted (in USD per share)	63.95
Vested (in USD per share)	33.52
Forfeited (in USD per share)	42.78
Ending balance (in USD per share)	$ 41.85	$ 30.01
Revest Shares
Number of Shares
Beginning balance (in shares)	784,000
Vested (in shares)	(336,000)
Cancelled/forfeited (in shares)	0
Ending balance (in shares)	448,000	784,000
Weighted-Average  Grant Date Fair Value Per Share
Beginning balance (in USD per share)	$ 97.84
Vested (in USD per share)	97.84
Forfeited (in USD per share)
Ending balance (in USD per share)	$ 97.84	$ 97.84
PSUs
Number of Shares
Beginning balance (in shares)	88,000
Granted (in shares)	71,000	75,828
Vested (in shares)	(57,000)
Cancelled/forfeited (in shares)	(12,000)	(12,090)
Ending balance (in shares)	90,000	88,000
Weighted-Average  Grant Date Fair Value Per Share
Beginning balance (in USD per share)	$ 65.11
Granted (in USD per share)	102.06
Vested (in USD per share)	44.25
Forfeited (in USD per share)	44.25
Ending balance (in USD per share)	$ 110.29	$ 65.11

X

- Definition

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

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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 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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