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Properties Held for Sale and Property Dispositions (Details)
$ in Millions
1 Months Ended
May 31, 2020
USD ($)
ft²
Mar. 31, 2020
USD ($)
ft²
Jun. 30, 2020
USD ($)
ft²
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Approximate Square Feet | ft²     29,843,409
400 East 58th Street      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Sales Price     $ 62.0
315 West 33rd Street      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Sales Price   $ 446.5  
Approximate Square Feet | ft²   492,987  
Gain (loss)   $ 72.3  
Accrued employee compensation in connection with realization of investment     6.0
609 Fifth Avenue      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Sales Price $ 168.0    
Approximate Square Feet | ft² 21,437    
Gain (loss) $ 65.4    
Accrued employee compensation in connection with realization of investment     $ 2.0