Share-based Compensation Arrangement by Share-based Payment Award, Achievement Condition, Percent

No definition available.

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Achievement Condition, Percent, Participant Two

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- Definition

The total fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans.

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Ratio Shares Granted per Unit

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vesting, Criteria One

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vesting, Criteria Three

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vesting, Criteria Two

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Number of Plans

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Share Rights

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- Definition

Share-based Compensation Arrangement by Share-based Payment, Installments

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Amount of cost capitalized for award under share-based payment arrangement.

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of additional cost recognized for award under share-based payment arrangement from occurrence of event accelerating recognition of cost.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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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

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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Number of shares authorized for issuance under share-based payment arrangement.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Price of a single share of a number of saleable stocks of a company.

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Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Share-Based Compensation - Additional Information (Details) $ / shares in Units, $ in Millions				1 Months Ended	3 Months Ended		9 Months Ended
	Aug. 19, 2024 shares	Feb. 01, 2024 USD ($) installment $ / shares shares	Jan. 22, 2024 shares	Feb. 29, 2024 shares	Sep. 30, 2024 USD ($) compensation_plan shares	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($) compensation_plan shares	Sep. 30, 2023 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of share-based incentive compensation plans \| compensation_plan					1		1
Effective registration shares (in shares)					12,600,000		12,600,000
Number of shares available for grant (in shares)					2,600,000		2,600,000
Share-based compensation expense \| $					$ 6.7	$ 12.3	$ 18.4	$ 33.4
Share-based compensation expense capitalized \| $					2.1	1.7	5.1	5.0
Share-based compensation not yet recognized \| $					$ 30.3		$ 30.3
Share-based compensation not yet recognized period of recognition							1 year 8 months 12 days
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted in period (in shares)				501,594
Performance-Based RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period							3 years
Number of shares granted in period (in shares)				265,205
Vesting, achievement of pre-set FFO per share goals, percentage of RSUs					100.00%		100.00%
Vesting, Average debt to EBIDTA ratio, percentage of RSUs					50.00%		50.00%
Vesting, Market measure, percentage of RSUs					50.00%		50.00%
Time-Based RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted in period (in shares)				236,389
Number of installments \| installment		3
Right to receive number of shares (in shares)		1
2024 Performance-Based RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				3 years
Vesting, achievement of pre-set FFO per share goals, percentage of RSUs				100.00%
Vesting, Average debt to EBIDTA ratio, percentage of RSUs				50.00%
Vesting, Market measure, percentage of RSUs				50.00%
Share-based compensation expense \| $							$ 2.5
Performance-based RSU, achievement target							150.00%
Number of shares issuable per RSU				1
Publicly-traded options, term		6 months
Fair value RSUs granted \| $		$ 9.5
2024 Performance Based RSUs, Debt to EBITDA Ratio Performance Condition
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance-based RSU, achievement target							100.00%
Time-Based Restricted Stock Units (RSUs), Grant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value RSUs granted \| $		$ 8.3
Share price (in dollars per share) \| $ / shares		$ 35.20
2023 Performance-Based RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance-based RSU, achievement target, all other participants, percent							150.00%
2022 Performance-Based RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance-based RSU, achievement target, all other participants, percent							150.00%
2023 Performance Based RSUs, Debt to EBITDA Ratio Performance Condition
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance-based RSU, achievement target, all other participants, percent					150.00%		150.00%
2022 Performance Based RSUs, Debt to EBITDA Ratio Performance Condition
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance-based RSU, achievement target, all other participants, percent					150.00%		150.00%
Chief Executive Officer \| 2024 Performance-Based RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance-based RSU, achievement target							175.00%
Chief Executive Officer \| Kilroy Realty 2006 Incentive Award Plan \| Time-Based Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			1 year
Number of shares granted in period (in shares)			101,627
Executive Vice President and Chief Financial Officer \| Jeffrey Kuehling 2006 Incentive Award Plan \| Time-Based Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	1 year 4 months 24 days
Number of shares granted in period (in shares)	20,373
Former CEO and Former President
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Accelerated share-based compensation costs \| $						$ 8.0		$ 21.2