Commitments and Contingencies Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014
Commitments and Contingencies [Abstract]
Letters of credit and completion bonds	$ 110.2
Performance bonds outstanding	76.7
Performance letters of credit outstanding	13.0
Financial letters of credit	13.8
Financial letters of credit representing deposits on land and lot purchase agreements	8.0
Financial Bonds	6.6
Unrecorded conditional purchase obligation	$ 441.4