Commitments and Contingencies Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014
Commitments and Contingencies [Abstract]
Letters of credit and completion bonds	$ 96.0
Performance bonds outstanding	66.0
Performance letters of credit outstanding	14.0
Financial letters of credit	11.7
Financial letters of credit representing deposits on land and lot purchase agreements	6.2
Financial Bonds	4.3
Unrecorded conditional purchase obligation	$ 445.3