AAM Common Stock Issued per MPG Common Stock as Part of the Merger Consideration

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Adjustment to Contractual Purchase Price - Existing Payable Balance

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Business Combination, Net Debt to be Assumed by Acquiring Entity. Gross Debt Assumed Less Cash Acquired.

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- Definition

MPG Pro Forma Net Income Adjustment

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The pro forma diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

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Price of a single share of a number of saleable stocks paid or offered to be paid in a business combination.

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- Definition

The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

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The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.

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This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.

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Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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The amount of identifiable intangible assets recognized as of the acquisition date.

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Amount of long-term debt due after one year or the normal operating cycle, if longer, assumed at the acquisition date.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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The cash inflow from a borrowing supported by a written promise to pay an obligation.

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Acquisition of MPG Narrative (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended				6 Months Ended
	Apr. 06, 2017	Mar. 31, 2018	Jun. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2018	Jun. 30, 2017
Business Acquisition [Line Items]
Business acquisition, share price	$ 13.50
Business acquisition, equity interest issued or issuable, number of shares	0.5
Proceeds from Issuance of Long-term Debt						$ 461.9	$ 2,857.9
Business Acquisition, Pro Forma Earnings Per Share, Diluted						$ 1.94
Metaldyne Performance Group, Inc. [Member]
Business Acquisition [Line Items]
Total consideration transferred				$ 1,530.2
Net debt acquired				$ 1,700.0
Debt acquired	$ 1,918.7
Cash acquired	(202.1)
Proceeds from Notes Payable					$ 1,200.0
Goodwill, purchase accounting adjustments		$ 0.9
Intangible assets	1,223.1
Adjustment to contractual purchase price for settlement of existing accounts payable balance	(12.4)
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual			$ 684.0			$ 1,470.0
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual			$ 28.0			120.0
Business Acquisition, Pro Forma Revenue						3,500.0
Business Acquisition, Pro Forma Net Income (Loss)						185.0
MPG Pro Forma Net Income Adjustment						$ 45.0
6.25% Notes due 2025 [Member] \| Metaldyne Performance Group, Inc. [Member]
Business Acquisition [Line Items]
Proceeds from Notes Payable					$ 700.0
Debt Instrument, Interest Rate, Stated Percentage					6.25%
6.50% Notes [Member] \| Metaldyne Performance Group, Inc. [Member]
Business Acquisition [Line Items]
Proceeds from Notes Payable					$ 500.0
Debt Instrument, Interest Rate, Stated Percentage					6.50%
Term Loan A [Member] \| Metaldyne Performance Group, Inc. [Member]
Business Acquisition [Line Items]
Proceeds from Issuance of Long-term Debt	100.0
Term Loan B [Member] \| Metaldyne Performance Group, Inc. [Member]
Business Acquisition [Line Items]
Proceeds from Issuance of Long-term Debt	$ 1,550.0