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Rate and Regulatory Matters (Details) (USD $)
In Millions, unless otherwise specified
0 Months Ended 1 Months Ended 0 Months Ended 1 Months Ended 9 Months Ended 1 Months Ended
Nov. 08, 2013
New Jersey Board of Public Utilities [Member]
Jun. 30, 2014
New Jersey Board of Public Utilities [Member]
May 31, 2014
New Jersey Board of Public Utilities [Member]
Aug. 19, 2014
Delware Public Service Commission [Member]
Tidewater [Member]
Jul. 02, 2014
Delware Public Service Commission [Member]
Tidewater [Member]
Nov. 25, 2013
Delware Public Service Commission [Member]
Tidewater [Member]
Apr. 30, 2014
Delware Public Service Commission [Member]
Tidewater [Member]
Sep. 30, 2014
Delware Public Service Commission [Member]
Tidewater [Member]
Apr. 30, 2014
Delware Public Service Commission [Member]
TESI [Member]
Regulatory Liabilities [Line Items]                  
Approved increase in annual operating revenues   $ 4.2              
Originally filed increase in annual operating revenue 10.6   3.6     3.9      
Approved increase in annual operating revenue (percentage)         6.50%        
Amended filed increase in annual operating revenue 8.1     0.8 2.5        
Return on equity   9.75%              
Base rate amount   208.6              
Refund of previously deferred revenues               0.4  
Projected annual revenue             0.6    
Reimbursements received for preliminary survey and investigation costs                 1.9
Gain on relinguishment of CPNC                 $ 0.1