DERIVATIVE INSTRUMENTS (Tables)

3 Months Ended

Mar. 31, 2018

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivative assets and derivative liabilities

The following table shows our derivative assets and derivative liabilities:

	March 31, 2018				December 31, 2017
(in millions)	Derivative Assets		Derivative Liabilities		Derivative Assets		Derivative Liabilities
Other current
Natural gas contracts	$	2.2	$	3.7	$	5.6	$	9.4
Petroleum products contracts	0.6		—		1.2		—
FTRs	1.5		—		4.4		—
Coal contracts	0.8		0.3		0.6		0.6
Total other current *	$	5.1	$	4.0	$	11.8	$	10.0
Other long-term
Natural gas contracts	$	—	$	1.1	$	0.1	$	1.4
Coal contracts	0.3		—		0.5		0.2
Total other long-term *	$	0.3	$	1.1	$	0.6	$	1.6
Total	$	5.4	$	5.1	$	12.4	$	11.6

* On our balance sheets, we classify derivative assets and liabilities as other current or other long-term based on the maturities of the underlying contracts.

Estimated notional volumes and realized gain (losses)

Our estimated notional sales volumes and realized gains (losses) were as follows:

	Three Months Ended March 31, 2018				Three Months Ended March 31, 2017
(in millions)	Volumes	Gains (Losses)			Volumes	Gains (Losses)
Natural gas contracts	48.1 Dth	$	(5.2	)	34.1 Dth	$	(0.3	)
Petroleum products contracts	2.1 gallons	0.5			4.9 gallons	(0.5		)
FTRs	8.2 MWh	3.7			9.2 MWh	3.0
Total		$	(1.0	)		$	2.2

Offsetting assets and liabilities

The following table shows derivative assets and derivative liabilities if derivative instruments by counterparty were presented net on our balance sheets:

	March 31, 2018							December 31, 2017
(in millions)	Derivative Assets			Derivative Liabilities				Derivative Assets			Derivative Liabilities
Gross amount recognized on the balance sheet	$	5.4		$	5.1			$	12.4		$	11.6
Gross amount not offset on the balance sheet	(2.1		)	(3.7		)	(1)	(4.9		)	(9.0		)	(2)
Net amount	$	3.3		$	1.4			$	7.5		$	2.6

⁽¹⁾   Includes cash collateral posted of $1.6 million.

⁽²⁾  Includes cash collateral posted of $4.1 million.