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Subsequent Event Subsequent Event (Details)
$ / shares in Units, $ in Thousands, customers in Millions, CAD in Billions
3 Months Ended 6 Months Ended
Jul. 19, 2017
CAD
customers
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jul. 19, 2017
USD ($)
customers
$ / shares
Dec. 31, 2016
USD ($)
Business Acquisition [Line Items]              
Hydro One Total Assets   $ 5,373,004   $ 5,373,004     $ 5,309,755
Hydro One Total Annual Revenues   $ 314,501 $ 318,838 $ 750,971 $ 737,011    
Subsequent Event [Member] | Hydro One [Member]              
Business Acquisition [Line Items]              
Hydro One Number of Customers | customers 1.3         1.3  
Business Acquisition, Share Price | $ / shares           $ 53.00  
Termination Fee Payable By Company           $ 103,000  
Subsequent Event [Member] | Canada, Dollars | Hydro One [Member]              
Business Acquisition [Line Items]              
Hydro One Total Assets | CAD CAD 25.0            
Hydro One Total Annual Revenues | CAD CAD 6.5