Employee Benefit Plans GM Cost Sharing (Narrative) (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]
Total GM Postretirement Cost Sharing Asset	$ 256.3	$ 287.8
GM Postretirement Cost Sharing Asset, Current	13.1
GM Postretirement Cost Sharing Asset, Noncurrent	$ 243.2	$ 274.5

Amounts estimated to be received from General Motors Company (GM), beyond one year of the balance sheet date, that relate to 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.

No definition available.

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