Derivative Financial Instruments (Tables)

9 Months Ended

Sep. 30, 2013

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Components of gain (loss) on derivatives, net

Gain (loss) on derivatives, net and current period settlements on derivative contracts were as follows:



	Three Months Ended September 30,					Nine Months Ended September 30,
	2013		2012			2013			2012
	(in millions)
Current period settlements on derivative contracts	$	33.9	$	(53.2	)	$	(3.9	)	$	(80.4	)
Gain (loss) on derivatives, net	$	72.5	$	(168.9	)	$	173.0		$	(277.4	)

Schedule of offsetting assets recorded as current assets and non-current assets in prepaid expenses and other current assets and other long-term assets in the Condensed Consolidated Balance Sheets



	As of December 31, 2012
Description	Gross Non-Current Assets		Gross Amounts Offset		Net Non-Current Assets Presented		Cash Collateral Not Offset		Net Amount
	(in millions)
Commodity Swaps	$	0.9	$	—	$	0.9	$	—	$	0.9
Total	$	0.9	$	—	$	0.9	$	—	$	0.9



	As of September 30, 2013
Description	Gross Current Assets		Gross Amounts Offset			Net Current Assets Presented		Cash Collateral Not Offset		Net Amount
	(in millions)
Commodity Swaps	$	104.1	$	(2.2	)	$	101.9	$	—	$	101.9
Total	$	104.1	$	(2.2	)	$	101.9	$	—	$	101.9



	As of September 30, 2013
Description	Gross Non-Current Assets		Gross Amounts Offset		Net Non-Current Assets Presented		Cash Collateral Not Offset		Net Amount
	(in millions)
Commodity Swaps	$	8.2	$	—	$	8.2	$	—	$	8.2
Total	$	8.2	$	—	$	8.2	$	—	$	8.2

Schedule of offsetting liabilities recorded as current liabilities in other current liabilities in the Condensed Consolidated Balance Sheet



	As of December 31, 2012
Description	Gross Current Liabilities		Gross Amounts Offset			Net Current Liabilities Presented		Cash Collateral Not Offset		Net Amount
	(in millions)
Commodity Swaps	$	74.2	$	(6.5	)	$	67.7	$	—	$	67.7
Total	$	74.2	$	(6.5	)	$	67.7	$	—	$	67.7

- Definition

Tabular disclosure of the location and amount of gains and losses reported in the statement of financial performance, or when applicable, the statement of financial position. For example, (a) gains and losses recognized in the income statement on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges and (b) gains and losses initially recognized in other comprehensive income on derivative instruments designated and qualifying as cash flow hedges.

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