Derivative Financial Instruments (Tables)

9 Months Ended

Sep. 30, 2013

Derivative Financial Instruments

Schedule of the gross fair values of derivatives on balance sheet

	September 30, 2013			December 31, 2012
	(in millions)
Unrealized gains in other current assets	$	—		$	0.2
Unrealized losses in other current liabilities		(1.5	)		(1.0	)
Net unrealized derivative losses	$	(1.5	)	$	(0.8	)

Schedule of effects of derivatives in consolidated statements of operations

	Three months ended September 30,						Nine months ended September 30,
	2013			2012			2013			2012
	(in millions)
Unrealized mark-to-market gains (losses)	$	(0.9	)	$	7.1		$	(0.1	)	$	9.6
Realized gains (losses)		(1.2	)		(5.7	)		(0.1	)		(22.2	)
Net derivative gains (losses)	$	(2.1	)	$	1.4		$	(0.2	)	$	(12.6	)

Schedule of offsetting of derivative assets and liabilities

				Gross amounts not offset in consolidated balance sheet
	Amounts presented in consolidated balance sheet(1)
				Financial instruments		Cash collateral received (pledged)		Net amount
September 30, 2013
Total derivative assets	$	—		$	—	$	—	$	—
Total derivative liabilities		1.5			—		—		1.5
Net assets (liabilities)	$	(1.5	)	$	—	$	—	$	(1.5	)
December 31, 2012
Total derivative assets	$	0.2		$	0.2	$	—	$	—
Total derivative liabilities		1.0			0.2		—		0.8
Net assets (liabilities)	$	(0.8	)	$	—	$	—	$	(0.8	)

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We report the fair values of our derivative assets and liabilities on a gross basis on our consolidated balance sheet. As a result, amounts recognized and net amounts presented are the same.