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Share-Based Compensation (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense		$ 1.2	$ 2.1
Restricted share awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of share awards vested	$ 3.4	$ 1.2
Total unvested restricted share awards (in shares)	388,984
Weighted average grant date fair value (in dollars per share)	$ 20.16
Compensation costs not yet recognized	$ 7.0
Recognition period for compensation expense	30 months
Washington Real Estate Investment Trust 2016 Omnibus Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate number of shares authorized for stock based awards (in shares)	2,400,000
Incentive plan, period in effect (in years)	10 years