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Compensation Plans - Summary of PSUs Under 2010 TRC Stock Incentive Plan (Details) - 2010 TRC Stock Incentive Plan [Member] - PSUs [Member]	12 Months Ended
	Dec. 31, 2020 $ / shares shares
Nonvested, number of shares [Roll Forward]
Outstanding, beginning of period (in shares) | shares	528,719
Granted (in shares) | shares	291,365
Vested (in shares) | shares	(101,030)
Outstanding, end of period (in shares) | shares	719,054
Weighted-average grant-date fair value [Roll Forward]
Outstanding, beginning period (in dollars per share) | $ / shares	$ 76.56
Granted (in dollars per shares) | $ / shares	69.70
Vested (in dollars per share) | $ / shares	99.71
Outstanding, end of period (in dollars per share) | $ / shares	$ 70.53

X

- 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).

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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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.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(i)-(ii)
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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.

+ References

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-Publisher FASB
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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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-Publisher FASB
-Name Accounting Standards Codification
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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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