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Summary of Significant Accounting Policies (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Business Information [Line Items]        
Deferred profit on sales $ 3.6      
Cash and cash equivalents 1,007.8 $ 1,303.2 $ 1,383.8 $ 661.8
Advertising expense 45.4 41.2 $ 42.4  
Homebuilding [Member]        
Business Information [Line Items]        
Cash and cash equivalents 973.0 1,271.8    
Earnest Money Deposits 227.6      
Homebuilding [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]        
Business Information [Line Items]        
Earnest Money Deposits 222.9 149.5    
Subsidiaries [Member]        
Business Information [Line Items]        
Cash and cash equivalents $ 36.7 $ 40.5