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Derivatives Foreign Currency Derivatives (Narrative) (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
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Derivative [Line Items] |  |
Total GM Postretirement Cost Sharing Asset | $ 273.0 | $ 270.6
Forward Contracts [Member] |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | $ 31.9 | $ 68.6

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- Definition Aggregate of the current and noncurrent amounts estimated to be received from General Motors Company (GM) associated with an agreement between us and GM to share proportionally in the cost of other postretirement employee benefits for eligible retirees based on the length of service an employee had with us and GM. + References No definition available. + Details
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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Details
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