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Assets and Liabilities Held for Sale (Details) - Disposal Group, Held-for-sale, Not Discontinued Operations - Corporate Headquarters Building - USD ($)
 3 Months Ended 6 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Assets and Liabilities Held for Sale [Line Items]          
Impairment of Real Estate   $ 0 $ 38,000,000.0 $ 0 $ 38,000,000.0
Forecast          
Assets and Liabilities Held for Sale [Line Items]          
Expected proceeds from sale of buildings $ 35,500,000        
Disposal group, not discontinued operations, earnest money deposits $ 100,000