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Share-Based Compensation - Summary of Restricted Stock and Performance Unit Award Activity (Details)	6 Months Ended
	Jun. 30, 2021 $ / shares shares
Restricted Stock
Restricted Stock and Performance Units [Roll Forward]
Outstanding at January 1, 2021 | shares	669,102
Granted | shares	173,970
Vested | shares	(161,741)	[1]
Forfeitures | shares	(5,496)
Outstanding at June 30, 2021 | shares	675,835
Restricted Stock and Performance Units (Weighted Average Grant-date Fair Value) [Abstract]
Weighted Average Grant-Date Fair Value, Outstanding at January 1, 2021 | $ / shares	$ 102.55
Weighted Average Grant-Date Fair Value, Granted | $ / shares	134.10
Weighted Average Grant-Date Fair Value, Vested | $ / shares	108.80	[1]
Weighted Average Grant-Date Fair Value, Forfeitures | $ / shares	109.07
Weighted Average Grant-Date Fair Value, Outstanding at June 30, 2021 | $ / shares	$ 109.12
Performance Units
Restricted Stock and Performance Units [Roll Forward]
Outstanding at January 1, 2021 | shares	357,417
Granted | shares	95,236
Vested | shares	(53,070)	[1]
Outstanding at June 30, 2021 | shares	399,583
Restricted Stock and Performance Units (Weighted Average Grant-date Fair Value) [Abstract]
Weighted Average Grant-Date Fair Value, Outstanding at January 1, 2021 | $ / shares	$ 103.63
Weighted Average Grant-Date Fair Value, Granted | $ / shares	140.47
Weighted Average Grant-Date Fair Value, Vested | $ / shares	135.33	[1]
Weighted Average Grant-Date Fair Value, Outstanding at June 30, 2021 | $ / shares	$ 108.20
[1] Upon vesting of the performance unit awards, PCA issued 58,083 shares, which includes 5,013 shares for dividends accrued during the vesting period.

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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-SubTopic 10
-Section 50
-Paragraph 2
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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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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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