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Commitments and Contingencies (Details)
$ in Millions
9 Months Ended
Sep. 30, 2021
USD ($)
Capital Addition Purchase Commitments  
Loss Contingencies  
Commitments $ 179.9
Unsecured debt | Revolving credit facility  
Loss Contingencies  
Letters of credit, amount outstanding 2.8
Real estate technology venture capital fund  
Loss Contingencies  
Commitments 28.0
Investment, contributions to date 14.7
Commitment remaining contribution amount $ 13.3