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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

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