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Goodwill and Intangible Assets (Tables)

6 Months Ended

Jun. 30, 2021

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill [Table Text Block]

The following table provides a reconciliation of changes in goodwill for the six months ended June 30, 2021:

															Consolidated
															(in millions)
Balance at December 31, 2020															$	185.7
Foreign currency translation															(0.6)
Balance at June 30, 2021															$	185.1

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:

			June 30,																		December 31,
			2021																		2020
			Gross Carrying Amount						Accumulated Amortization						Net Carrying Amount						Gross Carrying Amount						Accumulated Amortization						Net Carrying Amount
			(in millions)
Capitalized computer software			$	48.2					$	(36.8)					$	11.4					$	47.6					$	(33.9)					$	13.7
Customer platforms			856.2						(269.6)						586.6						856.2						(237.9)						618.3
Customer relationships			53.0						(14.5)						38.5						53.0						(12.8)						40.2
Technology and other			156.5						(54.6)						101.9						156.7						(48.2)						108.5
Total			$	1,113.9					$	(375.5)					$	738.4					$	1,113.5					$	(332.8)					$	780.7

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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