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Business Combinations - Acquisition of MPG Narrative (Detail) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Apr. 06, 2017
Business Acquisition [Line Items] |  |  |  |  |  |  |
Business Acquisition, Share Price |  |  |  |  |  |  | $ 13.50
AAM Common Stock Issued per MPG Common Stock as Part of the Merger Consideration |  |  |  |  |  |  | 0.5
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest |  |  | $ (533.0) | $ (113.9) | $ 340.0 |  |
Business Acquisition, Pro Forma Earnings Per Share, Diluted |  |  |  |  | $ 3.51 | $ 1.95 |
Share-based Payment Arrangement, Accelerated Cost |  |  |  |  | $ 20.0 |  |
Acquisition-related fair value inventory adjustment |  |  | 0.0 | 0.0 | (24.9) |  |
Restructuring and acquisition-related costs |  |  | $ 57.8 | $ 78.9 | 110.7 |  |
Metaldyne Performance Group, Inc. [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Percentage of equity interests acquired |  |  |  |  |  |  | 100.00%
Total consideration transferred | $ 1,530.2 |  |  |  | 1,500.0 |  |
Net debt assumed |  |  |  |  | 1,700.0 |  |
Debt acquired |  |  |  |  |  |  | $ 1,918.7
Cash and cash equivalents acquired |  |  |  |  |  |  | 202.1
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  |  |  |  |  |  | 1,223.1
Adjustment to Contractual Purchase Price - Existing Payable Balance |  |  |  |  |  |  | $ (12.4)
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual |  | $ 2,022.0 |  |  |  |  |
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual |  | 320.0 |  |  |  |  |
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual |  |  |  |  | 227.0 |  |
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest |  | $ 93.5 |  |  |  |  |
Business Acquisition, Pro Forma Revenue |  |  |  |  | 7,000.0 | $ 6,600.0 |
Business Acquisition, Pro Forma Net Income (Loss) |  |  |  |  | 400.0 | $ 220.0 |
Acquisition-related fair value inventory adjustment |  |  |  |  | 25.0 |  |
Restructuring and acquisition-related costs |  |  |  |  | 55.0 |  |
MPG Pro Forma Net Income Adjustment |  |  |  |  | $ 65.0 |  |

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- Definition Fair Value Inventory Adjustment from Acquisition of MPG - Inventory in process written up to fair value in purchase accounting that was sold in the period. Cost of goods sold (inventory) artificially high due to fair value mark up. + References No definition available. + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=116869197&loc=d3e4845-128472 + Details
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- Definition The amount of identifiable intangible assets recognized as of the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=116868840&loc=d3e2207-128464 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=116869197&loc=d3e4845-128472 + Details
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- Definition Amount of long-term debt due after one year or the normal operating cycle, if longer, assumed at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=116869197&loc=d3e4845-128472 + Details
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- Definition Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=68072869&loc=d3e41242-110953 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(10)) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(8)) -URI http://asc.fasb.org/extlink&oid=116637232&loc=SL114874131-224263 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22694-107794 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(15)) -URI http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260 + Details
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