Annual report pursuant to Section 13 and 15(d)

Solar Energy Systems, net - Additional Information (Details)

v3.8.0.1
Solar Energy Systems, net - Additional Information (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Solar Energy Systems Disclosure [Abstract]      
Depreciation expense $ 120.4 $ 93.4 $ 70.7
Amortization of deferred grants $ 7.7 $ 13.1 $ 14.2