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Derivatives Foreign Currency Derivatives (Narrative) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Derivative [Line Items]
Total GM Postretirement Cost Sharing Asset	$ 270.6	$ 254.4
Forward Contracts [Member]
Derivative [Line Items]
Derivative, Notional Amount	$ 68.6	$ 48.0

X

- 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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Balance Type:	debit
Period Type:	instant

X

- Definition

Monetary 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

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

X

- Details

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Period Type:	duration