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Noncontrolling Interests on the Company's Consolidated Financial Statements - Common Units of the Operating Partnership (Details)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 31, 2019
USD ($)
trading_day
$ / shares
shares
Dec. 31, 2018
USD ($)
$ / shares
shares
Mar. 31, 2018
shares
Noncontrolling Interest [Line Items]      
Common limited partnership interest in the Operating Partnership 2.00% 2.00% 2.10%
Common stock, par value (in dollars per share) | $ / shares $ 0.01 $ 0.01  
Number of trading days | trading_day 10    
Aggregate value upon redemption of outstanding noncontrolling common units | $ $ 153.3 $ 126.4  
Kilroy Realty L.P. [Member] | Common units [Member]      
Noncontrolling Interest [Line Items]      
Common units outstanding held by common limited partners | shares 2,023,287 2,025,287 2,070,690
Operating Partnership [Member]      
Noncontrolling Interest [Line Items]      
Common general partnership interest in the Operating Partnership 98.00% 98.00% 97.90%