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Nature Of Operations And Summary Of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Depreciation Provisions For Utility Plant As A Percentage Of The Original Cost
 
 
2014
 
2013
 
2012
Electric Operations
3.0
%
 
3.2
%
 
3.4
%
Gas Distribution and Transmission Operations
1.8
%
 
1.8
%
 
1.9
%
Computation Of Diluted Average Common Shares
 
Diluted Average Common Shares Computation
2014
 
2013
 
2012
Denominator (thousands)
 
 
 
 
 
Basic average common shares outstanding
315,120

 
312,402

 
291,927

Dilutive potential common shares
 
 
 
 
 
Nonqualified stock options
6

 
80

 
144

Shares contingently issuable under employee stock plans
1,066

 
708

 
557

Shares restricted under stock plans
444

 
456

 
544

Forward Agreements(1)
—

 
—

 
7,229

Diluted Average Common Shares
316,636

 
313,646

 
300,401

(1) On September 10, 2012, NiSource settled the Forward Agreements. Amounts included in diluted average common shares for the year ended December 31, 2012 are weighted for the period prior to settlement.