Commitments and Contingencies Commitments and Contingencies (Details) $ in Millions	Jun. 30, 2015 USD ($)
Commitments and Contingencies [Abstract]
Letters of credit and completion bonds	$ 131.9
Performance bonds outstanding	86.5
Performance letters of credit outstanding	19.5
Financial letters of credit	12.7
Financial letters of credit representing deposits on land and lot purchase agreements	6.7
Financial Bonds	13.2
Unrecorded conditional purchase obligation	$ 495.6