Discontinued Operations (Details) (Spinoff of Installation and Other Services, USD $) In Millions, unless otherwise specified	1 Months Ended	3 Months Ended
	Sep. 30, 2014	Mar. 31, 2015
Spinoff of Installation and Other Services
Selected financial information for the discontinued operations
Percentage of businesses planned for spinoff	100.00%
Costs and charges related to spin-off transaction		$ 4