XML 29 R77.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
ACQUISITIONS - China Wind Facility (Details) - China Wind Facility
¥ in Millions
1 Months Ended 12 Months Ended
Jul. 08, 2019
USD ($)
Dec. 31, 2019
USD ($)
Sep. 30, 2019
CNY (¥)
Sep. 30, 2019
USD ($)
Disclosure of detailed information about business combination [line items]        
Consideration transferred, acquisition-date fair value     ¥ 1,140 $ 160,000,000
Equity interests of acquirer $ 0.25      
Acquisition costs (less than) $ 1,000,000      
Revenue of acquirees as if combination occurred at beginning of period   $ 44,000,000