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Investment in Unconsolidated Ventures - Summarized Balance Sheet Information (Detail) - USD ($)
$ in Millions
Dec. 31, 2019
Sep. 30, 2019
Equity Method Investment, Summarized Financial Information, Assets [Abstract]    
Equity Method Investment, Summarized Financial Information, Assets $ 11.7 $ 15.3
Equity Method Investment, Summarized Financial Information, Liabilities and Equity [Abstract]    
Equity Method Investment, Summarized Financial Information, Liabilities and Equity 11.7 15.3
Investment in unconsolidated ventures 5.9 7.3
Cash and cash equivalents    
Equity Method Investment, Summarized Financial Information, Assets [Abstract]    
Equity Method Investment, Summarized Financial Information, Assets 1.4 1.6
Real estate    
Equity Method Investment, Summarized Financial Information, Assets [Abstract]    
Equity Method Investment, Summarized Financial Information, Assets 10.1 13.6
Other assets    
Equity Method Investment, Summarized Financial Information, Assets [Abstract]    
Equity Method Investment, Summarized Financial Information, Assets 0.2 0.1
Accounts Payable and Accrued Liabilities [Member]    
Equity Method Investment, Summarized Financial Information, Liabilities and Equity [Abstract]    
Equity Method Investment, Summarized Financial Information, Liabilities 0.3 0.3
Equity    
Equity Method Investment, Summarized Financial Information, Liabilities and Equity [Abstract]    
Equity Method Investment Summarized Financial Information, Equity $ 11.4 $ 15.0