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RISK MANAGEMENT ACTIVITIES (Tables)
 6 Months Ended
Jun. 30, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of assets and liabilities from risk management activities
The tables below show our assets and liabilities from risk management activities:
 
 
 
 
June 30, 2013
(Millions)
 
Balance Sheet Presentation *
 
Assets
 
Liabilities
Natural gas contracts
 
Other Current
 
$
0.2

 
$
0.3

FTRs
 
Other Current
 
2.7

 
0.6

Petroleum product contracts
 
Other Current
 
—

 
0.1

Coal contracts
 
Other Current
 
—

 
2.0

Coal contracts
 
Other Long-term
 
—

 
0.3

 
 
Other Current
 
2.9

 
3.0

 
 
Other Long-term
 
—

 
0.3

Total
 
 
 
$
2.9

 
$
3.3


*   We classify assets and liabilities from risk management activities as current or long-term based upon the maturities of the underlying contracts.
 
 

 
December 31, 2012
(Millions)
 
Balance Sheet Presentation *
 
Assets
 
Liabilities
Natural gas contracts
 
Other Current
 
$
0.1

 
$
0.6

FTRs
 
Other Current
 
1.2

 
0.1

Petroleum product contracts
 
Other Current
 
0.1

 
—

Coal contracts
 
Other Current
 
0.3

 
4.7

Coal contracts
 
Other Long-term
 
2.2

 
4.3

 
 
Other Current
 
1.7

 
5.4

 
 
Other Long-term
 
2.2

 
4.3

Total
 
 
 
$
3.9

 
$
9.7


*   We classify assets and liabilities from risk management activities as current or long-term based upon the maturities of the underlying contracts.
Offsetting Derivative Assets And Liabilities Subject To Master Netting Arrangement Table Text Block [Table Text Block]
 
 
June 30, 2013
(Millions)
 
Gross Amount
 
Gross Amount Not Offset on the Balance Sheet, Including Cash Collateral
 
Net Amount
Assets
 
 
 
 

 
 

Derivative assets subject to master netting or similar arrangements
 
$
2.9

 
$
0.8

 
$
2.1

Total risk management assets
 
$
2.9

 


 
$
2.1

 
 
 
 
 
 
 
Liabilities
 
 
 
 

 
 

Derivative liabilities subject to master netting or similar arrangements
 
$
1.0

 
$
1.0

 
$
—

Derivative liabilities not subject to master netting or similar arrangements
 
2.3

 
 
 
2.3

Total risk management liabilities
 
$
3.3

 


 
$
2.3


 
 
December 31, 2012
(Millions)
 
Gross Amount
 
Gross Amount Not Offset on the Balance Sheet, Including Cash Collateral
 
Net Amount
Assets
 
 
 
 

 
 

Derivative assets subject to master netting or similar arrangements
 
$
1.4

 
$
0.2

 
$
1.2

Derivative assets not subject to master netting or similar arrangements
 
2.5

 
 
 
2.5

Total risk management assets
 
$
3.9

 


 
$
3.7

 
 
 
 
 
 
 
Liabilities
 
 
 
 

 
 

Derivative liabilities subject to master netting or similar arrangements
 
$
0.7

 
$
0.7

 
$
—

Derivative liabilities not subject to master netting or similar arrangements
 
9.0

 
 
 
9.0

Total risk management liabilities
 
$
9.7

 


 
$
9.0
Schedule of Derivative Instruments Cash Collateral Positions [Table Text Block]
The following table shows our cash collateral positions:
(Millions)
 
June 30, 2013
 
December 31, 2012
Cash collateral provided to others related to contracts under master netting or similar arrangements *
 
$
3.7

 
$
4.3


*   Reflected in other current assets on the balance sheets.
Schedule of unrealized gains (losses) recorded related to derivatives
The following table shows the unrealized gains (losses) recorded related to derivative contracts:
 
 
 
 
Three Months Ended June 30
 
Six Months Ended June 30
(Millions)
 
Financial Statement Presentation
 
2013
 
2012
 
2013
 
2012
Natural gas
 
Balance Sheet — Regulatory assets (current)
 
$
(0.5
)
 
$
0.8

 
$
0.5

 
$
2.5

Natural gas
 
Balance Sheet — Regulatory liabilities (current)
 
(0.9
)
 
0.3

 
(0.1
)
 
0.3

Natural gas
 
Income Statement — Cost of fuel, natural gas, and purchased power
 
—

 
—

 
—

 
0.1

FTRs
 
Balance Sheet — Regulatory assets (current)
 
(1.0
)
 
(0.8
)
 
(0.8
)
 
(0.6
)
FTRs
 
Balance Sheet — Regulatory liabilities (current)
 
0.1

 
0.7

 
(0.3
)
 
0.3

Petroleum
 
Balance Sheet — Regulatory assets (current)
 
(0.1
)
 
(0.2
)
 
(0.1
)
 
(0.1
)
Petroleum
 
Balance Sheet — Regulatory liabilities (current)
 
—

 
(0.1
)
 
—

 
—

Coal
 
Balance Sheet — Regulatory assets (current)
 
0.8

 
(0.1
)
 
2.7

 
(3.2
)
Coal
 
Balance Sheet — Regulatory assets (long-term)
 
1.7

 
3.7

 
4.0

 
0.2

Coal
 
Balance Sheet — Regulatory liabilities (current)
 
(0.1
)
 
—

 
(0.3
)
 
—

Coal
 
Balance Sheet — Regulatory liabilities (long-term)
 
—

 
—

 
(2.2
)
 
—
Schedule of notional volumes of outstanding derivative contracts
We had the following notional volumes of outstanding derivative contracts:
 
 
June 30, 2013
 
December 31, 2012
Commodity
 
Purchases
 
Sales
 
Other  Transactions
 
Purchases
 
Other Transactions
Natural gas (millions of therms)
 
65.5

 
—

 
N/A

 
86.1

 
N/A

FTRs (millions of kilowatt-hours)
 
N/A

 
N/A

 
7,884.1

 
N/A

 
3,838.2

Petroleum products (barrels)
 
36,370.0

 
9,000.0

 
N/A

 
33,002.0

 
N/A

Coal contract (millions of tons)
 
4.4

 
0.1

 
N/A

 
5.1

 
N/A