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Stockholders' Equity - Restricted Stock Units (Details) - USD ($) $ / shares in Units, shares in Millions	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019	Dec. 31, 2018
Unvested restricted stock units
Shares
Nonvested beginning balance (in shares)	2.1	2.1	2.7
Granted	0.6
Vested	(1.1)
Forfeited	(0.1)
Nonvested ending balance (in shares)	2.1
Weighted Average Grant Date Fair Value
Weighted average grant date fair value (in dollars per share)		$ 91.60	$ 69.19
Granted	$ 141.76
Vested	66.81
Forfeited	$ 82.19
Aggregate intrinsic value		$ 320,500,000	$ 319,000,000.0
Total vest date fair value	$ 149,200,000
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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- Definition

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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- Definition

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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- Definition

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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- Definition

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

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

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