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Investments in and Advances to Joint Ventures - Revenues Earned By the Company from Unconsolidated Joint Ventures and Interest Income (Detail) - Unconsolidated Joint Ventures [Member] - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Revenue from contracts:        
Total revenue from contracts with customers $ 2.3 $ 3.4 $ 7.8 $ 9.5
Other 0.2 0.4 0.8 1.2
Revenue and other income 2.5 3.8 8.6 10.7
Asset and Property Management Fees [Member]        
Revenue from contracts:        
Total revenue from contracts with customers 1.7 2.8 6.2 8.0
Leasing commissions and development fees [Member]        
Revenue from contracts:        
Total revenue from contracts with customers $ 0.6 $ 0.6 $ 1.6 $ 1.5