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Earnings Per Share / Unit (EPS / EPU) - Additional Information (Details) - shares
Sep. 30, 2019
Sep. 30, 2018
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]    
Unvested Restricted Stock / Unit Awards 274,624 413,193
First Industrial, L.P.    
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]    
Unvested Restricted Stock / Unit Awards 400,181 413,193