Commitments and Contingencies (Details) ft² in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($) ft² Joint_Venture	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Loss Contingencies [Line Items]
Number of unrecorded tenant allowance commitments | Joint_Venture	1
Unrecorded tenant allowance commitment	$ 57.4
Unrecorded tenant allowance renewal term	20 years
Unrecorded tenant allowance expansion area | ft²	520
Collectibility of Tenant Reimbursements
Loss Contingencies [Line Items]
Recovery of previously recognized loss contingencies	$ 0.6
Additional expense related to such tenant audits/disputes		$ 0.5	$ 0.3