RISK MANAGEMENT ACTIVITIES (Tables)

6 Months Ended

Jun. 30, 2015

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Assets and liabilities from risk management activities

The following tables show our assets and liabilities from risk management activities:

		June 30, 2015
(Millions)	Balance Sheet Presentation*	Assets from Risk Management Activities		Liabilities from Risk Management Activities
Natural gas contracts	Other current	$	2.6	$	19.5
Natural gas contracts	Other long-term	1.0		2.9
FTRs	Other current	4.1		—
Petroleum product contracts	Other current	—		0.9
Coal contracts	Other current	—		4.1
Coal contracts	Other long-term	—		2.1
	Other current	6.7		24.5
	Other long-term	1.0		5.0
Total		$	7.7	$	29.5

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

		December 31, 2014
(Millions)	Balance Sheet Presentation*	Assets from Risk Management Activities		Liabilities from Risk Management Activities
Natural gas contracts	Other current	$	1.8	$	37.3
Natural gas contracts	Other long-term	0.5		5.3
FTRs	Other current	2.2		0.3
Petroleum product contracts	Other current	—		2.7
Petroleum product contracts	Other long-term	—		0.1
Coal contracts	Other current	—		2.4
Coal contracts	Other long-term	—		1.0
	Other current	4.0		42.7
	Other long-term	0.5		6.4
Total		$	4.5	$	49.1

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

Potential effect of netting arrangements for recognized derivative assets and liabilities

The following tables show the potential effect on our financial position of netting arrangements for recognized derivative assets and liabilities:

	June 30, 2015
(Millions)	Gross Amount		Potential Effects of Netting, Including Cash Collateral		Net Amount
Derivative assets subject to master netting or similar arrangements	$	7.7	$	3.0	$	4.7
Derivative assets not subject to master netting or similar arrangements	—				—
Total risk management assets	$	7.7			$	4.7
Derivative liabilities subject to master netting or similar arrangements	$	22.1	$	4.5	$	17.6
Derivative liabilities not subject to master netting or similar arrangements	7.4				7.4
Total risk management liabilities	$	29.5			$	25.0

	December 31, 2014
(Millions)	Gross Amount		Potential Effects of Netting, Including Cash Collateral		Net Amount
Derivative assets subject to master netting or similar arrangements	$	3.2	$	1.3	$	1.9
Derivative assets not subject to master netting or similar arrangements	1.3				1.3
Total risk management assets	$	4.5			$	3.2
Derivative liabilities subject to master netting or similar arrangements	$	45.7	$	8.8	$	36.9
Derivative liabilities not subject to master netting or similar arrangements	3.4				3.4
Total risk management liabilities	$	49.1			$	40.3

Cash collateral positions

The following table shows our cash collateral positions:

(Millions)	June 30, 2015		December 31, 2014
Cash collateral provided to others: *
Related to contracts under master netting or similar arrangements	$	19.0	$	11.6
Other	1.1		1.1

* Cash collateral provided to others is reflected in other current assets on our balance sheets.

Notional volumes of outstanding derivative contracts

The notional volumes of our outstanding derivative contracts were as follows:

	June 30, 2015		December 31, 2014
(Millions)	Purchases	Other Transactions	Purchases	Other Transactions
Natural gas (therms)	774.7	N/A	1,860.0	N/A
FTRs (kilowatt-hours)	N/A	8,577.9	N/A	4,287.7
Petroleum products (barrels)	0.1	N/A	0.1	N/A
Coal (tons)	2.2	N/A	3.0	N/A

Unrealized gains (losses) related to derivatives

The table below shows the unrealized gains (losses) recorded related to our derivative contracts:

		Three Months Ended June 30				Six Months Ended June 30
(Millions)	Financial Statement Presentation	2015		2014		2015		2014
Natural gas	Balance Sheet — Regulatory assets	11.9		(1.0	)	22.2		(0.3	)
Natural gas	Balance Sheet — Regulatory liabilities	0.8		(3.3	)	(0.6	)	(0.3	)
Natural gas	Income Statement — Operating and maintenance expense	0.2		(0.1	)	0.1		0.1
FTRs	Balance Sheet — Regulatory assets	(7.2	)	(1.0	)	(7.0	)	(0.9	)
FTRs	Balance Sheet — Regulatory liabilities	2.4		1.1		2.0		1.0
Petroleum	Balance Sheet — Regulatory assets	0.5		—		0.9		—
Petroleum	Income Statement — Operating and maintenance expense	0.6		0.1		1.0		0.1
Coal	Balance Sheet — Regulatory assets	0.6		(0.1	)	(4.0	)	0.5
Coal	Balance Sheet — Regulatory liabilities	—		0.9		—		2.5