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Property Dispositions and Properties Held for Sale (Details)
$ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2024
USD ($)
ft²
Jul. 31, 2024
USD ($)
ft²
Jun. 30, 2024
USD ($)
ft²
Jun. 30, 2023
USD ($)
ft²
Dec. 31, 2025
USD ($)
ft²
Mar. 31, 2025
USD ($)
ft²
Dec. 31, 2025
USD ($)
ft²
Dec. 31, 2024
USD ($)
ft²
Dec. 31, 2023
USD ($)
Property Dispositions and Assets Held for Sale                  
Employee-related liabilities $ 16.8       $ 11.0   $ 11.0 $ 16.8 $ 2.0
Discontinued Operation, Gain (Loss) On Disposal, Statement Of Income Or Comprehensive Income, Extensible Enumeration, Not Disclosed Flag             investment dispositions investment dispositions investment dispositions
Charge related to fair value adjustment       $ 17.0          
Ownership percentage deconsolidated       50.10%          
100 Park Avenue                  
Property Dispositions and Assets Held for Sale                  
Unaudited Approximate Usable Square Feet | ft²         834,000   834,000    
Sales price         $ 425.0   $ 425.0    
Gain (Loss) on Sale             $ 0.0    
Ownership interest disposed (in percent)         49.00%   49.00%    
Charge related to fair value adjustment         $ 23.5        
Giorgio Armani Residences at 760 Madison Avenue (6 Condominium Units)                  
Property Dispositions and Assets Held for Sale                  
Unaudited Approximate Usable Square Feet | ft²           19,185      
Sales price           $ 99.3      
Gain (Loss) on Sale           $ 0.2      
Giorgio Armani Residences at 760 Madison Avenue (3 Condominium Units)                  
Property Dispositions and Assets Held for Sale                  
Unaudited Approximate Usable Square Feet | ft² 13,590             13,590  
Sales price $ 63.5             $ 63.5  
Gain (Loss) on Sale (1.5)                
Palisades Premier Conference Center                  
Property Dispositions and Assets Held for Sale                  
Unaudited Approximate Usable Square Feet | ft²   450,000              
Sales price   $ 26.3              
Gain (Loss) on Sale   $ 7.3              
719 Seventh Avenue                  
Property Dispositions and Assets Held for Sale                  
Unaudited Approximate Usable Square Feet | ft²     10,040            
Sales price     $ 30.5            
Gain (Loss) on Sale     $ (2.0)            
245 Park Avenue                  
Property Dispositions and Assets Held for Sale                  
Unaudited Approximate Usable Square Feet | ft²       1,782,793          
Sales price       $ 1,995.0          
Gain (Loss) on Sale       $ (28.3)          
Ownership interest disposed (in percent)       49.90%          
Properties Sold in 2025, 2024 and 2023                  
Property Dispositions and Assets Held for Sale                  
Employee-related liabilities $ 5.1       $ 0.0   $ 0.0 $ 5.1 $ 11.3