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Commitments And Contingencies (Details) - USD ($)
$ in Millions
 10 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2018
Dec. 31, 2009
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Sep. 18, 2014
Jan. 10, 2014
Commitments And Contingencies [Line Items]                
Letter of credit and performance obligations $ 7.8 $ 7.8            
Property insurance program per occurrence limits 1,000.0 1,000.0            
Per occurrence limit for NBCR Coverage   1,000.0            
Value of program trigger 160.0 $ 160.0            
Coinsurance of program trigger   18.00%            
Deductible in insurance as a percentage of the value of the affected property, San Francisco and Los Angeles   3.00%            
Per occurrence limit of the earthquake insurance which covers San Francisco and Los Angeles regions 240.0              
Annual aggregate limit of the earthquake insurance which covers San Francisco and Los Angeles regions 240.0              
Amount of earthquake insurance provided by IXP, LLC as direct insurer San Francisco and Los Angeles   $ 20.0            
767 Venture, LLC [Member]                
Commitments And Contingencies [Line Items]                
Maximum funding obligation 116.1 116.1            
Property insurance program per occurrence limits 1,625.0 1,625.0            
Lehman [Member]                
Commitments And Contingencies [Line Items]                
Bankruptcy claim, amount filed by general creditor     $ 45.3          
Bankruptcy claim amount allowed by court to creditor               $ 45.2
Bankruptcy Claims, Amount of Claims Settled 0.3 0.3   $ 0.4 $ 1.4 $ 8.1 $ 7.7  
Bankruptcy remaining claim amount allowed by court to creditor 27.2 27.2            
601 Lexington Avenue                
Commitments And Contingencies [Line Items]                
Coverage For Acts Of Terrorism Under TRIA Covered in Excess of Amount Covered by IXP   250.0            
Boston Properties Limited Partnership                
Commitments And Contingencies [Line Items]                
Operating partnership guarantee to cover liabilities of IXP $ 20.0 $ 20.0