Manufacturing Facility Fire and Insurance Recovery (Notes)	9 Months Ended
	Sep. 30, 2021
Insurance Recoveries [Abstract]
Manufacturing Facility Fire and Insurance Recovery	15. MANUFACTURING FACILITY FIRE AND INSURANCE RECOVERY On September 22, 2020, a significant industrial fire occurred at our Malvern Manufacturing Facility in Ohio (Malvern Fire). All associates were evacuated safely and without injury and we were able to maintain continuity of supply to our customers without any significant disruptions. Our insurance policies are expected to cover the repair, replacement or actual cash value of the assets that incurred loss or damage, less our applicable deductible of $1.0 million. In addition, our insurance policies are expected to provide coverage for interruption to our business, including lost or reduced profits and reimbursement for certain expenses and costs that are incurred relating to the fire. In the nine months ended September 30, 2021, we recorded $13.7 million of charges primarily related to transportation and freight, asset repairs and other costs incurred to resume or relocate operations and ensure continuity of supply to our customers. We also recorded an estimated insurance recovery of $24.8 million and received reimbursements and advances under our insurance policies of approximately $51.1 million, of which approximately $28.0 million is presented as an operating cash flow and approximately $23.1 million is presented as an investing cash flow in our Condensed Consolidated Statement of Cash Flows. This resulted in net pre-tax income in our Condensed Consolidated Statement of Operations of approximately $11.1 million in Cost of goods sold for the nine months ended September 30, 2021. At September 30, 2021, $16.9 million of insurance recovery receivable is included in Prepaid expenses and other in our Condensed Consolidated Balance Sheet. Since the date of the Malvern Fire and the establishment of the insurance claim, we have incurred $50.3 million of total charges primarily related to site services and clean-up, transportation and freight, asset repairs and other costs incurred to resume or relocate operations and ensure continuity of supply to our customers. In addition, we have recorded a total of $27.0 million of costs primarily associated with the write-down of property, plant and equipment as a result of damage from the fire. We have recorded total estimated insurance recoveries of $79.1 million and have received total reimbursements and advances under our insurance policies of $62.2 million, of which $11.1 million was received in 2020 and $51.1 million was received in the first nine months of 2021. In the fourth quarter of 2020, we determined that we will cease production at the Malvern Manufacturing Facility and relocate production capacity to other AAM manufacturing facilities during 2021. As such, we cannot estimate the total claim eligible costs that we will incur as a result of the Malvern Fire and the associated relocation of production capacity to other AAM manufacturing facilities. At September 30, 2021, we have estimated the amount of expected insurance proceeds recoverable in consideration of the policy provisions, estimated repair costs or actual cash value of damaged assets, and claim eligible expenses incurred from the date of the fire. We expect the claim settlement process to continue through 2021 and, based on the provisions of the policy, the process could continue into 2022. We will update our estimates as additional information becomes available, however, the actual impact on our results of operations, financial position or cash flows, or the timing of such impact, could differ from our estimates.