Solar Energy Systems, Net - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Leases [Abstract]
Depreciation expense	$ 19.3	$ 14.2	$ 51.3	$ 39.7
Amortization of deferred grants	$ 3.5	$ 3.5	$ 10.6	$ 10.4