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Revenues (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Revenue from External Customer [Line Items]        
Revenues $ 287.1 $ 159.1 $ 594.2 $ 406.4
Real Estate [Member]        
Revenue from External Customer [Line Items]        
Revenues 280.2 156.4 587.1 373.5
Land [Member]        
Revenue from External Customer [Line Items]        
Revenues $ 6.9 $ 2.7 $ 7.1 $ 32.9