Document and Entity Information - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Feb. 12, 2019	Jun. 30, 2018
Document Information [Line Items]
Entity Registrant Name	AMERICAN AXLE & MANUFACTURING HOLDINGS INC
Entity Central Index Key	0001062231
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	FY
Document Period End Date	Dec. 31, 2018
Amendment Flag	false
Document Type	10-K
Entity Well-known Seasoned Issuer	Yes
Entity Public Float			$ 1,727.8
Entity Common Stock, Shares Outstanding		111,732,271
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Shell Company	false
Trading Symbol	AXL