Share-Based Compensation - RSU and PSU Activity (Details) - Restricted stock unit and performance stock unit - $ / shares shares in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Number of Shares
Beginning balance, shares	334	0
Granted, shares	256	336
Vested, shares	(76)	0
Forfeited, shares	(14)	(2)
Ending balance, shares	500	334
Weighted Average Grant Date Fair Value per Share
Beginning balance (dollar per share)	$ 221.25	$ 0
Granted (dollar per share)	241.19	221.29
Vested (dollar per share)	221.15	0
Forfeited (dollar per share)	229.75	229.75
Ending balance (dollar per share)	$ 231.57	$ 221.25

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

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
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-Subparagraph (c)(1)(iv)(3)
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Per share or unit weighted-average intrinsic value of award forfeited under share-based payment arrangement. Excludes share and unit options.

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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).

+ References

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

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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

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

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