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PROPOSED MERGER (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Apr. 20, 2016
Feb. 09, 2016
Mar. 31, 2016
External Legal, Advisory and Financial Services Fees      
Proposed Merger      
Merger related expenses     $ 9.9
Certain Internal Labor and Associated Costs      
Proposed Merger      
Merger related expenses     $ 3.1
ITC Holdings      
Proposed Merger      
Cash per common share   $ 22.57  
Fortis stock per common share   $ 0.7520  
Ownership percentage of Fortis after close of merger   27.00%  
ITC Holdings | Termination Fee Upon Specified Conditions      
Proposed Merger      
Fee for termination of agreement   $ 245.0  
GIC Private Limited | Subsequent Event      
Proposed Merger      
Ownership percentage of minority investor upon completion of merger 19.90%    
Business acquisition, transaction costs $ 1,228.0    
Fortis | Termination Fee Related to Regulatory Approvals or Legal Matters      
Proposed Merger      
Fee for termination of agreement related to regulatory approvals or matters   $ 280.0