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Properties Held for Sale and Property Dispositions (Details)
$ in Millions
1 Months Ended
Jun. 30, 2021
USD ($)
ft²
Mar. 31, 2021
USD ($)
ft²
Feb. 28, 2021
USD ($)
ft²
Jan. 31, 2021
USD ($)
ft²
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Area of Real Estate Property | ft² 27,962,796      
712 Madison Avenue        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Area of Real Estate Property | ft²       6,600
Sales Price       $ 43.0
Gain (loss)       $ (1.4)
133 Greene Street        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Area of Real Estate Property | ft²     6,425  
Sales Price     $ 15.8  
Gain (loss)     $ 0.2  
106 Spring Street (3)        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Area of Real Estate Property | ft²   5,928    
Sales Price $ 35.0      
Gain (loss)   $ (2.8)    
635-641 Sixth Avenue        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Area of Real Estate Property | ft² 267,000      
Sales Price $ 325.0      
Gain (loss) 99.4      
Properties Sold In 2021        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Employee-related liabilities $ 5.7