DERIVATIVE INSTRUMENTS (Tables)

6 Months Ended

Jun. 30, 2019

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivative assets and derivative liabilities

The following table shows our derivative assets and derivative liabilities, none of which are designated as hedging instruments.

	June 30, 2019				December 31, 2018
(in millions)	Derivative Assets		Derivative Liabilities		Derivative Assets		Derivative Liabilities
Other current
Natural gas contracts	$	0.2	$	3.7	$	0.8	$	1.0
FTRs	4.6		—		3.0		—
Coal contracts	0.4		—		0.2		—
Total other current *	$	5.2	$	3.7	$	4.0	$	1.0
Other long-term
Natural gas contracts	$	—	$	0.3	$	—	$	0.1
Coal contracts	0.3		—		0.2		—
Total other long-term *	$	0.3	$	0.3	$	0.2	$	0.1
Total	$	5.5	$	4.0	$	4.2	$	1.1

* 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)

Realized gains (losses) on derivatives are primarily recorded in cost of sales on the income statements. Our estimated notional sales volumes and realized gains (losses) were as follows:

	Three Months Ended June 30, 2019				Three Months Ended June 30, 2018
(in millions)	Volumes	Gains (Losses)			Volumes	Gains (Losses)
Natural gas contracts	8.7 Dth	$	(0.7	)	8.3 Dth	$	(0.3	)
Petroleum products contracts	— gallons	—			0.6 gallons	0.1
FTRs	2.4 MWh	2.5			2.0 MWh	3.0
Total		$	1.8			$	2.8

	Six Months Ended June 30, 2019				Six Months Ended June 30, 2018
(in millions)	Volumes	Gains (Losses)			Volumes	Gains (Losses)
Natural gas contracts	20.8 Dth	$	(1.2	)	21.3 Dth	$	(2.0	)
Petroleum products contracts	— gallons	—			1.3 gallons	0.2
FTRs	5.0 MWh	3.2			4.4 MWh	5.9
Total		$	2.0			$	4.1

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:

	June 30, 2019							December 31, 2018
(in millions)	Derivative Assets			Derivative Liabilities				Derivative Assets			Derivative Liabilities
Gross amount recognized on the balance sheet	$	5.5		$	4.0			$	4.2		$	1.1
Gross amount not offset on the balance sheet	(0.2		)	(3.8		)	(1)	(0.8		)	(1.1		)	(2)
Net amount	$	5.3		$	0.2			$	3.4		$	—

⁽¹⁾  Includes cash collateral posted of $3.6 million.

⁽²⁾ 

Includes cash collateral posted of $0.3 million.