XML 78 R74.htm IDEA: XBRL DOCUMENT v3.20.1
Termination of Proposed Acquisition by Hydro One Termination of Proposed Acquisition by Hydro One (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Jan. 24, 2019
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Business Acquisition [Line Items]        
Merger termination fee   $ 0 $ 103,000  
Merger transaction costs   $ 0 $ 19,664 $ 19,700
Hydro One [Member]        
Business Acquisition [Line Items]        
Merger termination fee $ 103,000