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Fair Value (Tables)
 9 Months Ended
Sep. 30, 2016
Fair Value Disclosures [Abstract]  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis
Recurring Fair Value Measurements. The following tables present financial assets and liabilities measured and recorded at fair value on NiSource’s Condensed Consolidated Balance Sheets (unaudited) on a recurring basis and their level within the fair value hierarchy as of September 30, 2016 and December 31, 2015:
 
Recurring Fair Value Measurements
September 30, 2016 (in millions)
Quoted Prices in
Active Markets
for Identical
Assets
(Level 1)
 
Significant
Other
Observable
Inputs
(Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
 
Balance as of September 30, 2016
Assets
 
 
 
 
 
 
 
Risk management assets
$
1.9

 
$
5.7

 
$
—

 
$
7.6

Available-for-sale securities
—

 
137.1

 
—

 
137.1

Total
$
1.9

 
$
142.8

 
$
—

 
$
144.7

Liabilities
 
 
 
 
 
 
 
Risk management liabilities(1)
$
4.5

 
$
266.5

 
$
0.1

 
$
271.1

Total
$
4.5

 
$
266.5

 
$
0.1

 
$
271.1

(1) Includes $6.6 million of current risk management liabilities which are included in "Other accruals" on the Condensed Consolidated Balance Sheets (unaudited).
Recurring Fair Value Measurements
December 31, 2015 (in millions)
Quoted Prices in
Active Markets
for Identical
Assets
(Level 1)
 
Significant
Other
Observable
Inputs
(Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
 
Balance as of
December 31, 2015
Assets
 
 
 
 
 
 
 
Risk management assets
$
0.1

 
$
—

 
$
—

 
$
0.1

Available-for-sale securities
—

 
128.7

 
—

 
128.7

Total
$
0.1

 
$
128.7

 
$
—

 
$
128.8

Liabilities
 
 
 
 
 
 
 
Risk management liabilities(1)
$
14.3

 
$
17.4

 
$
0.2

 
$
31.9

Total
$
14.3

 
$
17.4

 
$
0.2

 
$
31.9


(1) Includes $9.3 million of current risk management liabilities which are included in "Other accruals" on the Condensed Consolidated Balance Sheets (unaudited).
Schedule of Available-For-Sale Securities
The amortized cost, gross unrealized gains and losses and fair value of available-for-sale securities at September 30, 2016 and December 31, 2015 were: 
September 30, 2016 (in millions)
Amortized
Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Fair
Value
Available-for-sale securities
 
 
 
 
 
 
 
U.S. Treasury securities
$
37.4

 
$
0.9

 
$
—

 
$
38.3

Corporate/Other debt securities
97.1

 
1.9

 
(0.2
)
 
98.8

Total Available-for-sale securities
$
134.5

 
$
2.8

 
$
(0.2
)
 
$
137.1

December 31, 2015 (in millions)
Amortized
Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Fair
Value
Available-for-sale securities
 
 
 
 
 
 
 
U.S. Treasury securities
$
33.7

 
$
0.1

 
$
(0.3
)
 
$
33.5

Corporate/Other debt securities
95.7

 
0.3

 
(0.8
)
 
95.2

Total Available-for-sale securities
$
129.4

 
$
0.4

 
$
(1.1
)
 
$
128.7
Carrying Amount And Estimated Fair Values Of Financial Instruments
The carrying amount and estimated fair values of these financial instruments were as follows:
 
(in millions)
Carrying
Amount as of
September 30, 2016
 
Estimated Fair
Value as of
September 30, 2016
 
Carrying
Amount as of
Dec. 31, 2015
 
Estimated Fair
Value as of
Dec. 31, 2015
Long-term debt (including current portion)
$
6,678.8

 
$
7,639.9

 
$
6,382.2

 
$
6,975.7