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Derivative Instruments (Details 2) (USD $) In Millions	Jun. 30, 2011	Dec. 31, 2010
Fair value derivative assets and liabilities classified in condensed balance sheets
Derivative Assets	$ 4.5	$ 4.8
Derivative Liabilities	106.9	118.4
Commodity contract \| Current assets
Fair value derivative assets and liabilities classified in condensed balance sheets
Derivative Assets	3.1	2.7
Commodity contract \| Long term assets
Fair value derivative assets and liabilities classified in condensed balance sheets
Derivative Assets	1.4	2.1
Commodity contract \| Current liability
Fair value derivative assets and liabilities classified in condensed balance sheets
Derivative Liabilities	60.4	84.9
Commodity contract \| Long term liabilities
Fair value derivative assets and liabilities classified in condensed balance sheets
Derivative Liabilities	$ 46.5	$ 33.5

Fair values as of the balance sheet date of all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements.

+ References+ Details

- Definition

Fair values as of the balance sheet date of all liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements.

+ References+ Details