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Goodwill and Intangible Assets (Tables)

3 Months Ended

Mar. 31, 2020

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill [Table Text Block]

The following table provides a reconciliation of changes in goodwill for the three months ended March 31, 2020:

			Driveline						Metal Forming																		Consolidated
			(in millions)
Balance at December 31, 2019			$	398.3					$	300.8																	$	699.1
Impairment charge			(210.8)						(299.2)																		(510.0)
Foreign currency translation			(6.4)						(1.6)																		(8.0)
Balance at March 31, 2020			$	181.1					$	—																	$	181.1

Schedule of Finite-Lived Intangible Assets [Table Text Block]

The following table provides a reconciliation of the gross carrying amount and associated accumulated amortization for AAM's other intangible assets, which are all subject to amortization:

			March 31,																														December 31,
			2020																														2019
			Gross Carrying Amount						Accumulated Amortization						Net Carrying Amount						Gross Carrying Amount						Accumulated Amortization						Net Carrying Amount
			(in millions)
Capitalized computer software			$	45.8					$	(29.2)					$	16.6					$	45.8					$	(27.6)					$	18.2
Customer platforms			856.2						(190.3)						665.9						856.2						(174.4)						681.8
Customer relationships			53.0						(10.3)						42.7						53.0						(9.4)						43.6
Technology and other			155.7						(38.1)						117.6						156.0						(35.1)						120.9
Total			$	1,110.7					$	(267.9)					$	842.8					$	1,111.0					$	(246.5)					$	864.5

X

- References

No definition available.

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- Definition

Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275

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- Definition

Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13854-109267

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