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- Narrative (Details)
$ / shares in Units, $ in Millions
1 Months Ended 2 Months Ended 3 Months Ended
Feb. 14, 2018
USD ($)
$ / shares
shares
Jan. 28, 2016
shares
Feb. 28, 2017
Feb. 28, 2018
USD ($)
shares
Mar. 31, 2019
USD ($)
plan
$ / shares
shares
Mar. 31, 2018
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of share-based incentive compensation plans | plan         1  
Share-based compensation expense | $         $ 8.8 $ 5.1
Share-based compensation expense capitalized | $         1.6 $ 1.5
Share-based compensation not yet recognized | $         $ 73.8  
Share-based compensation not yet recognized period of recognition         2 years 10 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%  
Vesting, Average debt to EBIDTA ratio, percentage of RSUs         50.00%  
Vesting, Market measure, percentage of RSUs         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 10 months  
Fair value per share on valuation date 2 years 11 months          
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      
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  
Number of shares available for grant         300,000  
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) 143,396