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Share-Based and Other Compensation - (Details) - USD ($) $ in Millions			12 Months Ended
	Aug. 19, 2024	Jan. 22, 2024	Dec. 31, 2023
Chief Executive Officer and Former President
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation expense related to accelerated			$ 27.3
Chief Executive Officer | RSUs granted | Kilroy Realty 2006 Incentive Award Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants in period (in shares)		101,627
Vesting period		1 year
Executive Vice President and Chief Financial Officer | RSUs granted | Jeffrey Kuehling 2006 Incentive Award Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants in period (in shares)	20,373
Vesting period	1 year 4 months 24 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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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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