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Employee Benefit Plans | 3 Months Ended
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Mar. 31, 2013
Employee Benefit Plans [Abstract] |
Pension and Other Postretirement Benefits Disclosure [Text Block] | 7. EMPLOYEE BENEFIT PLANS The components of net periodic benefit cost (credit) are as follows:
|  | Pension Benefits
|  | Three Months Ended
|  | March 31,
|  | 2013 |  | 2012
|  | (in millions)
Service cost |  | $ | 0.9 |  |  | $ | 0.8 |
Interest cost |  | 8.5 |  |  | 8.8 |
Expected asset return |  | (11.5 | ) |  | (8.0 | )
Amortized loss |  | 2.4 |  |  | 1.8 |
Amortized prior service cost |  | 0.3 |  |  | — |
Net periodic benefit cost |  | $ | 0.6 |  |  | $ | 3.4 |
|  | Other Postretirement Benefits
|  | Three Months Ended
|  | March 31,
|  | 2013 |  | 2012
|  | (in millions)
Service cost |  | $ | 0.1 |  |  | $ | 0.1 |
Interest cost |  | 3.3 |  |  | 3.9 |
Amortized loss |  | 0.2 |  |  | 0.2 |
Amortized prior service credit |  | (0.4 | ) |  | (0.5 | )
Curtailment gain |  | — |  |  | (21.8 | )
Net periodic benefit cost (credit) |  | $ | 3.2 |  |  | $ | (18.1 | )
We recorded a gain of $21.8 million to cost of goods sold for the curtailment of certain other postretirement benefits (OPEB) in the three months ended March 31, 2012. This resulted primarily from the reduction in the expected future OPEB related to the DMC and CKMF hourly associates who terminated employment from AAM as a result of our plant closures. These curtailment gains resulted in an increase in our accumulated other comprehensive loss of $21.8 million. Due to our significant pension contributions made in 2012, we will not make any cash payments in 2013 to satisfy our regulatory funding requirements. We expect our cash outlay for other postretirement benefit obligations in 2013, net of GM cost sharing, to be approximately $15 million.

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 158 -Paragraph 7, 21, 22 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS106-2 -Paragraph 20, 21, 22 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Implementation Guide (Q and A) -Number FAS88 -Paragraph 63 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 106 -Paragraph 518 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5, 6, 7, 8 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. 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