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Stockholders' Equity - Restricted Stock Units (Details) - USD ($) $ / shares in Units, shares in Millions	9 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Unvested restricted stock units
Shares
Nonvested balance at beginning of period (shares)	1.8
Granted (shares)	0.4
Vested (shares)	(1.0)
Forfeited (shares)	0.0
Nonvested balance at end of period (shares)	1.2
Weighted Average Grant Date Fair Value
Balance at beginning of period (USD per share)	$ 96.63
Granted (USD per share)	296.24
Vested (USD per share)	88.57
Forfeited (USD per share)	119.25
Balance at end of period (USD per share)	$ 176.10
Aggregate intrinsic value	$ 500,800,000	$ 392,000,000.0
Total vest date fair value	305,200,000
Performance Shares
Weighted Average Grant Date Fair Value
Total vest date fair value	$ 0

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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- Definition

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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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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Intrinsic value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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