DERIVATIVE INSTRUMENTS

12 Months Ended

Dec. 31, 2016

Derivative Instruments and Hedging Activities Disclosure [Abstract]

DERIVATIVE INSTRUMENTS

DERIVATIVE INSTRUMENTS

The following table shows our derivative assets and derivative liabilities:

	December 31, 2016				December 31, 2015
(in millions)	Derivative Assets		Derivative Liabilities		Derivative Assets		Derivative Liabilities
Other current
Natural gas contracts	$	0.2	$	—	$	0.3	$	0.9
Petroleum products contracts	—		—		—		0.5
FTRs	2.0		—		2.0		—
Coal contracts	—		0.9		—		3.3
Total other current	$	2.2	$	0.9	$	2.3	$	4.7
Other long-term
Coal contracts	$	0.1	$	0.5	$	—	$	1.4
Total	$	2.3	$	1.4	$	2.3	$	6.1

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

	December 31, 2016				December 31, 2015				December 31, 2014
(in millions)	Volume	Gains (Losses)			Volume	Gains (Losses)			Volume	Gains (Losses)
Natural gas contracts	28.6 Dth	$	(1.4	)	22.9 Dth	$	(4.9	)	20.0 Dth	$	0.6
Petroleum products contracts	4.4 gallons	(0.6		)	6.1 gallons	(1.7		)	5.3 gallons	(0.1		)
FTRs	8.4 MWh	6.0			9.0 MWh	3.3			8.7 MWh	3.2
Total		$	4.0			$	(3.3	)		$	3.7

At December 31, 2016 and 2015, we had posted cash collateral of $16.1 million and $17.6 million, respectively, in our margin accounts.

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

	December 31, 2016				December 31, 2015
(in millions)	Derivative Assets		Derivative Liabilities		Derivative Assets			Derivative Liabilities
Gross amount recognized on the balance sheet	$	2.3	$	1.4	$	2.3		$	6.1
Gross amount not offset on the balance sheet *	—		—		(0.3		)	(1.4		)
Net amount	$	2.3	$	1.4	$	2.0		$	4.7

* Includes cash collateral posted of $1.1 million at December 31, 2015. There was no cash collateral included at December 31, 2016.