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Fair Value (Tables)
 3 Months Ended
Mar. 31, 2017
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 March 31, 2017 and December 31, 2016:
 
Recurring Fair Value Measurements
March 31, 2017 (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 March 31, 2017
Assets
 
 
 
 
 
 
 
Risk management assets
$
1.5

 
$
37.0

 
$
0.4

 
$
38.9

Available-for-sale securities
—

 
128.2

 
—

 
128.2

Total
$
1.5

 
$
165.2

 
$
0.4

 
$
167.1

Liabilities
 
 
 
 
 
 
 
Risk management liabilities
$
1.8

 
$
63.5

 
$
—

 
$
65.3

Total
$
1.8

 
$
63.5

 
$
—

 
$
65.3



Recurring Fair Value Measurements
December 31, 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
December 31, 2016
Assets
 
 
 
 
 
 
 
Risk management assets
$
5.4

 
$
43.6

 
$
—

 
$
49.0

Available-for-sale securities
—

 
131.5

 
—

 
131.5

Total
$
5.4

 
$
175.1

 
$
—

 
$
180.5

Liabilities
 
 
 
 
 
 
 
Risk management liabilities
$
1.2

 
$
58.9

 
$
1.2

 
$
61.3

Total
$
1.2

 
$
58.9

 
$
1.2

 
$
61.3
Schedule of Available-For-Sale Securities
The amortized cost, gross unrealized gains and losses and fair value of available-for-sale securities at March 31, 2017 and December 31, 2016 were: 
March 31, 2017 (in millions)
Amortized
Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Fair
Value
Available-for-sale securities
 
 
 
 
 
 
 
U.S. Treasury debt securities
$
33.8

 
$
—

 
$
(0.1
)
 
$
33.7

Corporate/Other debt securities
94.8

 
0.4

 
(0.7
)
 
94.5

Total
$
128.6

 
$
0.4

 
$
(0.8
)
 
$
128.2

December 31, 2016 (in millions)
Amortized
Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Fair
Value
Available-for-sale securities
 
 
 
 
 
 
 
U.S. Treasury debt securities
$
35.0

 
$
0.1

 
$
(0.6
)
 
$
34.5

Corporate/Other debt securities
98.7

 
0.3

 
(2.0
)
 
97.0

Total
$
133.7

 
$
0.4

 
$
(2.6
)
 
$
131.5
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
March 31, 2017
 
Estimated Fair
Value as of
March 31, 2017
 
Carrying
Amount as of
Dec. 31, 2016
 
Estimated Fair
Value as of
Dec. 31, 2016
Long-term debt (including current portion)
$
6,400.0

 
$
7,040.8

 
$
6,421.3

 
$
7,064.1