Incentive Plan - Summary of activity for Service-Based Restricted Stock Units (Details)	6 Months Ended
Jun. 30, 2021 $ / shares shares
Units
Granted (shares)	132,041
Service-Based Restricted Stock Units
Units
Unvested beginning of period (shares)	783,219
Granted (shares)	243,107
Vested (shares)	(327,773)
Cancelled or expired (shares)	(30,366)
Unvested end of period (shares)	668,187
Weighted-Average Grant Date Fair Value
Unvested, beginning of period (in dollars per share) \| $ / shares	$ 123.04
Granted (in dollars per share) \| $ / shares	135.44
Vested (in dollars per share) \| $ / shares	120.04
Cancelled or expired (in dollars per share) \| $ / shares	129.01
Unvested, end of period (in dollars per share) \| $ / shares	$ 128.75
Service-Based Restricted Stock Units \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period	4 years

Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Performance Period

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- 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
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-SubTopic 10
-Section 50
-Paragraph 2
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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

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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No definition available.

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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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-Publisher FASB
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No definition available.

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- Definition

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

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- Definition

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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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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