v3.20.4

Share-based Compensation - Summary of Performance Share Units (Detail) - Long Term Incentive Plans - USD ($)		12 Months Ended
	Oct. 29, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Weighted  average grant date  fair value in USD
Unrecognized compensation cost		$ 0	$ 0
Performance Share Units
Weighted  average grant date  fair value in USD
Weighted average grant date fair value, Granted (in dollars per share)	$ 167.64
Performance Share Units | Financial Performance Conditions
Shares
Shares, Outstanding at January 1, 2019 (in shares)		195,098
Shares, Granted (in shares)		0
Shares, Vested (in shares)		0
Shares, Forfeited (in shares)		195,098
Shares, Outstanding at December 31, 2019 (in shares)		0	195,098
Weighted  average grant date  fair value in USD
Weighted average grant date fair value, Outstanding at January 1, 2018 (in dollars per share)		$ 75.60
Weighted average grant date fair value, Granted (in dollars per share)		0
Weighted average grant date fair value, Vested (in dollars per share)		0
Weighted average grant date fair value, Forfeited (in dollars per share)		75.60
Weighted average grant date fair value, Outstanding at December 31, 2018 (in dollars per share)		$ 0	$ 75.60
Performance Share Units | Market Performance Conditions
Shares
Shares, Outstanding at January 1, 2019 (in shares)		1,844,187
Shares, Granted (in shares)		335,567
Shares, Vested (in shares)		0
Shares, Forfeited (in shares)		48,060
Shares, Outstanding at December 31, 2019 (in shares)		2,131,694	1,844,187
Weighted  average grant date  fair value in USD
Weighted average grant date fair value, Outstanding at January 1, 2018 (in dollars per share)		$ 125.61
Weighted average grant date fair value, Granted (in dollars per share)		164.92	$ 141.64	$ 121.18
Weighted average grant date fair value, Vested (in dollars per share)		0
Weighted average grant date fair value, Forfeited (in dollars per share)		125.28
Weighted average grant date fair value, Outstanding at December 31, 2018 (in dollars per share)		$ 131.81	$ 125.61

X

- Definition

Amount of cost to be recognized for option under share-based payment arrangement.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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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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- 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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- 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).

+ References

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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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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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- 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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