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Fair Value Measurements Fair Value Measurements, Schedule of Quantitative Information for Level 3 Derivative Contracts (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Derivative Asset	$ 95,100,000us-gaap_DerivativeAssets	$ 85,700,000us-gaap_DerivativeAssets
Derivative Liability	(110,700,000)us-gaap_DerivativeLiabilities	(96,800,000)us-gaap_DerivativeLiabilities
Midwest Premium Swap Beginning Curve Value	0.166
Midwest Premium Swap Contracts Ending Curve Value	0.134
Midwest premium swap contracts \| Aluminum \| Income Approach Valuation Technique \| Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Derivative Asset	100,000
Derivative Liability	$ (3,700,000)

Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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- Definition

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

+ References+ Details