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Share-Based Compensation - Narrative (Details)
$ / shares in Units, $ in Millions
1 Months Ended 2 Months Ended 3 Months Ended 6 Months Ended
Feb. 01, 2019
USD ($)
$ / shares
shares
Feb. 14, 2018
shares
Jan. 28, 2016
shares
Feb. 28, 2017
installment
Feb. 28, 2018
shares
Jun. 30, 2019
USD ($)
compensation_plan
shares
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
compensation_plan
shares
Jun. 30, 2018
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Number of share-based incentive compensation plans | compensation_plan           1   1  
Share-based compensation expense | $           $ 8.7 $ 11.5 $ 17.5 $ 16.6
Share-based compensation expense capitalized | $           1.9 $ 2.8 3.5 $ 4.3
Share-based compensation not yet recognized | $           $ 70.5   $ 70.5  
Share-based compensation not yet recognized period of recognition               2 years 6 months  
2019 Performance-Based RSUs [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Vesting period       3 years       3 years  
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%  
Number of shares issuable per RSU     1            
Share price | $ / shares $ 69.89                
Fair value per share on valuation date | $ / shares $ 72.57                
Remaining expected life, including future volatility               5 years 9 months 18 days  
Fair value per share on valuation date   2 years 10 months 24 days              
Fair value RSUs granted | $ $ 10.2                
2019 Time-Based RSUs [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Vesting period       3 years          
Number of installments | installment       3          
Right to receive number of shares (in shares) 1                
Time-Based Restricted Stock Units (RSUs), 2019 Time-Based RSU Grant [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Fair value RSUs granted | $ $ 10.1                
Kilroy Realty 2006 Incentive Award Plan [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Effective registration shares (in shares)           9,200,000   9,200,000  
Number of shares available for grant           200,000   200,000  
Executive Officer share-based compensation programs [Member] | Restricted Stock Units (RSUs) [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Number of shares granted in period         288,378        
Executive Officer share-based compensation programs [Member] | Market Measure-Based Restricted Stock Units (RSUs) [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Number of shares granted in period         143,396        
Executive Officer share-based compensation programs [Member] | Time-Based Restricted Stock Units (RSUs) [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Number of shares granted in period         144,982        
Market measure-based RSU estimate of probable [Member] | Market Measure-Based Restricted Stock Units (RSUs) [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Capital shares reserved for future issuance (in shares)   212,957