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Subsequent Events - Narrative (Details) - USD ($)
$ in Millions
Jan. 29, 2021
Jan. 15, 2021
Dec. 31, 2020
Kilroy Realty 2006 Incentive Award Plan [Member]      
Subsequent Event [Line Items]      
Share-based compensation arrangement by share-based payment award, number of shares available for grant     1,500,000
Subsequent event [Member]      
Subsequent Event [Line Items]      
Payments of dividends   $ 59.4  
Subsequent event [Member] | Kilroy Realty 2006 Incentive Award Plan [Member] | Time-Based Restricted Stock Units (RSUs) [Member] | Chief Executive Officer [Member]      
Subsequent Event [Line Items]      
Share-based compensation arrangement by share-based payment award, number of shares available for grant 102,799    
Subsequent event [Member] | Kilroy Realty 2006 Incentive Award Plan [Member] | Market measure-based Restricted Stock Units (RSUs) [Member] | Chief Executive Officer [Member]      
Subsequent Event [Line Items]      
Recognition period 3 years