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Commitments and Contingencies Commitments and Contingencies (Details)
$ in Millions
Jun. 30, 2016
USD ($)
Commitments and Contingencies [Abstract]  
Letters of credit and completion bonds $ 130.2
Performance bonds outstanding 85.5
Performance letters of credit outstanding 30.2
Financial letters of credit 7.1
Financial letters of credit representing deposits on land and lot purchase agreements 5.2
Financial Bonds 7.4
Unrecorded conditional purchase obligation $ 533.1