Commitments and Contingencies Legal Liabilities (Details) $ in Millions	3 Months Ended
	Jun. 30, 2016 USD ($) homes	Mar. 31, 2016 USD ($) homes	Dec. 31, 2015 USD ($)
Other Liabilities Disclosure [Abstract]
Product Liability Accrual, Component Amount | $	$ 2.8	$ 2.2	$ 0.5
Estimated Repair Costs for Affected Homes | $	$ 2.9	$ 1.8
Number of Affected Homes | homes	178	138
Additional Number of Affected Homes Associated with Repair Costs | homes	130
Number of Affected Homes on which Repairs Were Resolved | homes	90
Amount Reserved for Legal Expenses | $	$ 0.2		$ 0.6