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Subsequent Events	9 Months Ended
	Sep. 30, 2016
Subsequent Event [Line Items]
Subsequent Events [Text Block]	12. SUBSEQUENT EVENTS On November 3, 2016, AAM entered into a definitive merger agreement with Metaldyne Performance Group Inc. (MPG) under which AAM will acquire MPG for approximately $1.6 billion in cash and stock, plus the assumption of $1.7 billion in net debt (comprised of approximately $1.8 billion in debt, reduced by approximately $0.1 billion of MPG cash and cash equivalents). Under the terms of the agreement, each share of MPG's common stock will be converted into the right to receive $13.50 per share in cash and 0.5 share of AAM common stock. Upon closing of the transaction, AAM's shareholders will own approximately 70% of the combined company and MPG's shareholders will own approximately 30%. The transaction has been approved by the board of directors of both AAM and MPG, and is now subject to shareholder and regulatory approval and other customary closing conditions.

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The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, catastrophic loss, significant foreign exchange rate changes, loans to insiders or affiliates, and transactions not in the ordinary course of business.

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