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Risk Management Activities (Tables)
 3 Months Ended
Mar. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]
Risk management assets and liabilities on NiSource’s derivatives are presented on the Condensed Consolidated Balance Sheets (unaudited) as shown below:
(in millions)
March 31, 2017
 
December 31, 2016
Risk Management Assets - Current(1)
 
 
 
Interest rate risk programs
$
16.9

 
$
17.0

Commodity price risk programs
3.1

 
7.4

Total
$
20.0

 
$
24.4

Risk Management Assets - Noncurrent(2)
 
 
 
Interest rate risk programs
$
17.0

 
$
17.1

Commodity price risk programs
1.9

 
7.5

Total
$
18.9

 
$
24.6

Risk Management Liabilities - Current(3)
 
 
 
Interest rate risk programs
$
11.5

 
$
15.3

Commodity price risk programs
0.9

 
1.5

Total
$
12.4

 
$
16.8

Risk Management Liabilities - Noncurrent
 
 
 
Interest rate risk programs
$
20.6

 
$
24.5

Commodity price risk programs
32.3

 
20.0

Total
$
52.9

 
$
44.5

(1)Presented in "Prepayments and other" on the Condensed Consolidated Balance Sheets (unaudited).
(2)Presented in "Deferred charges and other" on the Condensed Consolidated Balance Sheets (unaudited).
(3)Presented in "Other accruals" on the Condensed Consolidated Balance Sheets (unaudited).