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Employee Benefit Plans | 9 Months Ended
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Sep. 30, 2014
Employee Benefit Plans [Abstract] |
Pension and Other Postretirement Benefits Disclosure [Text Block] | 6. EMPLOYEE BENEFIT PLANS The components of net periodic benefit cost (credit) are as follows:
|  | Pension Benefits
|  | Three Months Ended |  | Nine Months Ended
|  | September 30, |  | September 30,
|  | 2014 |  | 2013 |  | 2014 |  | 2013
|  | (in millions)
Service cost |  | $ | 0.9 |  |  | $ | 0.8 |  |  | $ | 2.7 |  |  | $ | 2.6 |
Interest cost |  | 9.0 |  |  | 8.5 |  |  | 27.0 |  |  | 25.5 |
Expected asset return |  | (12.1 | ) |  | (11.5 | ) |  | (36.3 | ) |  | (34.5 | )
Amortized loss |  | 1.3 |  |  | 2.2 |  |  | 3.9 |  |  | 7.0 |
Amortized prior service cost |  | — |  |  | 4.8 |  |  | — |  |  | 5.4 |
Net periodic benefit cost (credit) |  | $ | (0.9 | ) |  | $ | 4.8 |  |  | $ | (2.7 | ) |  | $ | 6.0 |
|  | Other Postretirement Benefits
|  | Three Months Ended |  | Nine Months Ended
|  | September 30, |  | September 30,
|  | 2014 |  | 2013 |  | 2014 |  | 2013
|  | (in millions)
Service cost |  | $ | 0.1 |  |  | $ | 0.1 |  |  | $ | 0.3 |  |  | $ | 0.3 |
Interest cost |  | 3.8 |  |  | 3.3 |  |  | 11.4 |  |  | 9.9 |
Amortized loss |  | 0.2 |  |  | 0.2 |  |  | 0.6 |  |  | 0.6 |
Amortized prior service credit |  | (0.7 | ) |  | (0.4 | ) |  | (2.1 | ) |  | (1.3 | )
Net periodic benefit cost |  | $ | 3.4 |  |  | $ | 3.2 |  |  | $ | 10.2 |  |  | $ | 9.5 |
Due to the availability of our prefunding balances (previous contributions in excess of prior required pension contributions), we are not required to make any cash payments in 2014. We expect our cash payments for other postretirement benefit obligations in 2014, net of GM cost sharing, to be approximately $17 million. In the third quarter of 2013, we remeasured our AAM Supplemental Executive Retirement Plan (SERP) due to the passing of our Co-Founder and Executive Chairman of the Board of Directors. As a result of this remeasurement, we recorded $4.7 million in selling, general & administrative expense related to the acceleration of prior service cost.

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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 Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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