Employee Benefit Plans Change in Benefit Obligation and Plan Assets (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Cost of Providing Special or Contractual Termination Benefits Recognized During Period			$ 1.8
Defined Benefit Plan, Fair Value of Plan Assets at End of Period	441.7	412.4
Pension Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Service Cost	4.8	4.9	5.2
Defined Benefit Plan, Interest Cost	37.1	36.8	36.1
Defined Benefit Plan, Cost of Providing Special or Contractual Termination Benefits Recognized During Period	0	0	2.5
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Service Cost	0.9	1.0	2.3
Defined Benefit Plan, Interest Cost	17.1	16.1	17.8
Defined Benefit Plan, Cost of Providing Special or Contractual Termination Benefits Recognized During Period	0	0	(0.7)
Change in Benefit Obligation [Member] \| Pension Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Benefit Obligation at Beginning of Period	665.4	619.6
Defined Benefit Plan, Service Cost	4.8	4.9
Defined Benefit Plan, Interest Cost	37.1	36.8
Defined Benefit Plan, Plan Amendments	0	4.4
Defined Benefit Plan, Actuarial Net (Gains) Losses	45.5	35.3
Change in GM Portion of OPEB Obligation	0	0
Defined Benefit Plan, Contributions by Plan Participants	0.6	0.7
Defined Benefit Plan, Curtailments	(2.5)	0.1
Defined Benefit Plan, Benefits Paid	(33.7)	(33.6)
Defined Benefit Plan, Foreign Currency Exchange Rate Changes, Benefit Obligation	(0.5)	(2.8)
Defined Benefit Plan, Benefit Obligation, Period Increase (Decrease)	51.3	45.8
Defined Benefit Plan, Benefit Obligation at End of Period	716.7	665.4
Defined Benefit Plan, Contributions by Plan Participants	0.6	0.7
Defined Benefit Plan, Benefits Paid	(33.7)	(33.6)
Change in Benefit Obligation [Member] \| Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Benefit Obligation at Beginning of Period	564.3	507.1
Defined Benefit Plan, Service Cost	0.9	1.0
Defined Benefit Plan, Interest Cost	17.1	16.1
Defined Benefit Plan, Plan Amendments	0	0
Defined Benefit Plan, Actuarial Net (Gains) Losses	11.4	25.4
Change in GM Portion of OPEB Obligation	16.2	25.1
Defined Benefit Plan, Contributions by Plan Participants	0	0
Defined Benefit Plan, Curtailments	(10.0)	0
Defined Benefit Plan, Benefits Paid	(11.5)	(10.4)
Defined Benefit Plan, Foreign Currency Exchange Rate Changes, Benefit Obligation	0	0
Defined Benefit Plan, Benefit Obligation, Period Increase (Decrease)	24.1	57.2
Defined Benefit Plan, Benefit Obligation at End of Period	588.4	564.3
Defined Benefit Plan, Contributions by Plan Participants	0	0
Defined Benefit Plan, Benefits Paid	(11.5)	(10.4)
Change in Plan Assets [Member] \| Pension Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Contributions by Plan Participants	0.6	0.7
Defined Benefit Plan, Benefits Paid	(33.7)	(33.6)
Defined Benefit Plan, Fair Value of Plan Assets at Beginning of Period	412.4	358.7
Defined Benefit Plan, Actual Return on Plan Assets	11.0	44.7
Defined Benefit Plan, Contributions by Employer	52.0	44.0
Defined Benefit Plan, Contributions by Plan Participants	0.6	0.7
Defined Benefit Plan, Benefits Paid	(33.7)	(33.6)
Defined Benefit Plan, Foreign Currency Exchange Rate Changes, Plan Assets	(0.6)	(2.1)
Defined Benefit Plan, Fair Value of Plan Assets, Period Increase (Decrease)	29.3	53.7
Defined Benefit Plan, Fair Value of Plan Assets at End of Period	441.7	412.4
Change in Plan Assets [Member] \| Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Contributions by Plan Participants	0	0
Defined Benefit Plan, Benefits Paid	(11.5)	(10.4)
Defined Benefit Plan, Fair Value of Plan Assets at Beginning of Period	0	0
Defined Benefit Plan, Actual Return on Plan Assets	0	0
Defined Benefit Plan, Contributions by Employer	11.5	10.4
Defined Benefit Plan, Contributions by Plan Participants	0	0
Defined Benefit Plan, Benefits Paid	(11.5)	(10.4)
Defined Benefit Plan, Foreign Currency Exchange Rate Changes, Plan Assets	0	0
Defined Benefit Plan, Fair Value of Plan Assets, Period Increase (Decrease)	0	0
Defined Benefit Plan, Fair Value of Plan Assets at End of Period	$ 0	$ 0

Change in the amount estimated to be received from General Motors Company (GM) that relates 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.