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Contingencies - Litigation and Other Matters (Details)
$ in Millions
3 Months Ended 9 Months Ended
Mar. 31, 2019
Community
Jun. 30, 2019
USD ($)
Community
Sep. 30, 2018
USD ($)
Loss Contingencies [Line Items]      
Number of communities impaired | Community   10  
Legal Reserve      
Loss Contingencies [Line Items]      
Accrued amounts for litigation and other contingent liabilities   $ 3.2 $ 3.7
Performance Bonds      
Loss Contingencies [Line Items]      
Letters of credit secured using cash collateral   49.2  
Outstanding performance bonds   $ 286.5  
CALIFORNIA      
Loss Contingencies [Line Items]      
Number of communities impaired | Community 15