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Supplemental Guarantor Condensed Consolidating Statements of Income (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Net sales
External	$ 1,817.0	$ 1,724.4	$ 5,576.3	$ 4,532.1
Intercompany	0.0	0.0	0.0	0.0
Revenues	1,817.0	1,724.4	5,576.3	4,532.1
Cost of goods sold	1,549.6	1,426.7	4,661.2	3,707.3
Gross profit	267.4	297.7	915.1	824.8
Selling, general and administrative expenses	96.3	102.3	288.6	289.1
Amortization of intangible assets	24.8	24.4	74.5	50.8
Restructuring and acquisition-related costs	11.7	22.8	66.8	90.5
Gain on sale of business	0.0	0.0	(15.5)	0.0
Operating income	134.6	148.2	500.7	394.4
Nonoperating Income (Expense)	(59.1)	(56.2)	(164.5)	(147.8)
Income (loss) before income taxes	75.5	92.0	336.2	246.6
Income tax expense (benefit)	11.5	5.7	31.4	15.6
Earnings from equity in subsidiaries	0.0	0.0	0.0	0.0
Net income (loss) before royalties	64.0	86.3	304.8	231.0
Royalties	0.0	0.0	0.0	0.0
Net income after royalties	64.0	86.3	304.8	231.0
Net income attributable to noncontrolling interests	(0.2)	(0.1)	(0.5)	(0.2)
Net income attributable to AAM	63.8	86.2	304.3	230.8
Other comprehensive income, net of tax	1.5	47.0	(20.9)	104.5
Comprehensive income attributable to AAM	65.3	133.2	283.4	335.3
Holdings [Member]
Net sales
External	0.0	0.0	0.0	0.0
Intercompany	0.0	0.0	0.0	0.0
Revenues	0.0	0.0	0.0	0.0
Cost of goods sold	0.0	0.0	0.0	0.0
Gross profit	0.0	0.0	0.0	0.0
Selling, general and administrative expenses	0.0	0.0	0.0	0.0
Amortization of intangible assets	0.0	0.0	0.0	0.0
Restructuring and acquisition-related costs	0.0	0.0	0.0	0.0
Gain on sale of business			0.0
Operating income	0.0	0.0	0.0	0.0
Nonoperating Income (Expense)	0.0	0.0	0.0	0.0
Income (loss) before income taxes	0.0	0.0	0.0	0.0
Income tax expense (benefit)	0.0	0.0	0.0	0.0
Earnings from equity in subsidiaries	63.8	86.2	304.3	230.8
Net income (loss) before royalties	63.8	86.2	304.3	230.8
Royalties	0.0	0.0	0.0	0.0
Net income after royalties	63.8	86.2	304.3	230.8
Net income attributable to noncontrolling interests	0.0	0.0	0.0	0.0
Net income attributable to AAM	63.8	86.2	304.3	230.8
Other comprehensive income, net of tax	1.5	47.0	(20.9)	104.5
Comprehensive income attributable to AAM	65.3	133.2	283.4	335.3
AAM Inc. [Member]
Net sales
External	247.1	250.0	851.4	806.9
Intercompany	0.7	0.2	4.0	2.4
Revenues	247.8	250.2	855.4	809.3
Cost of goods sold	220.6	229.6	804.5	752.2
Gross profit	27.2	20.6	50.9	57.1
Selling, general and administrative expenses	63.4	57.8	183.4	196.0
Amortization of intangible assets	1.0	1.5	3.9	4.3
Restructuring and acquisition-related costs	5.0	21.6	31.1	87.0
Gain on sale of business			0.0
Operating income	(42.2)	(60.3)	(167.5)	(230.2)
Nonoperating Income (Expense)	(60.0)	(60.8)	(193.8)	(148.7)
Income (loss) before income taxes	(102.2)	(121.1)	(361.3)	(378.9)
Income tax expense (benefit)	(1.0)	(29.0)	8.1	(62.2)
Earnings from equity in subsidiaries	68.1	29.9	241.6	202.9
Net income (loss) before royalties	(33.1)	(62.2)	(127.8)	(113.8)
Royalties	87.6	84.9	256.8	253.6
Net income after royalties	54.5	22.7	129.0	139.8
Net income attributable to noncontrolling interests	0.0	0.0	0.0	0.0
Net income attributable to AAM	54.5	22.7	129.0	139.8
Other comprehensive income, net of tax	1.0	16.7	(2.6)	55.3
Comprehensive income attributable to AAM	55.5	39.4	126.4	195.1
Guarantor Subsidiaries [Member]
Net sales
External	544.3	529.0	1,699.2	1,139.8
Intercompany	75.6	80.0	231.6	214.7
Revenues	619.9	609.0	1,930.8	1,354.5
Cost of goods sold	594.2	546.3	1,713.3	1,188.0
Gross profit	25.7	62.7	217.5	166.5
Selling, general and administrative expenses	19.6	24.7	61.4	45.7
Amortization of intangible assets	22.9	22.3	68.0	45.0
Restructuring and acquisition-related costs	3.9	0.0	31.8	0.0
Gain on sale of business			(15.5)
Operating income	(20.7)	15.7	71.8	75.8
Nonoperating Income (Expense)	2.8	5.5	11.0	14.9
Income (loss) before income taxes	(17.9)	21.2	82.8	90.7
Income tax expense (benefit)	0.1	17.8	0.6	42.0
Earnings from equity in subsidiaries	33.8	25.5	141.6	41.4
Net income (loss) before royalties	15.8	28.9	223.8	90.1
Royalties	0.7	1.3	2.6	2.6
Net income after royalties	16.5	30.2	226.4	92.7
Net income attributable to noncontrolling interests	0.0	0.0	0.0	0.0
Net income attributable to AAM	16.5	30.2	226.4	92.7
Other comprehensive income, net of tax	(10.3)	42.6	(50.5)	74.7
Comprehensive income attributable to AAM	6.2	72.8	175.9	167.4
Non-Guarantor Subsidiaries [Member]
Net sales
External	1,025.6	945.4	3,025.7	2,585.4
Intercompany	10.8	7.0	31.1	19.9
Revenues	1,036.4	952.4	3,056.8	2,605.3
Cost of goods sold	821.9	738.0	2,410.1	2,004.1
Gross profit	214.5	214.4	646.7	601.2
Selling, general and administrative expenses	13.3	19.8	43.8	47.4
Amortization of intangible assets	0.9	0.6	2.6	1.5
Restructuring and acquisition-related costs	2.8	1.2	3.9	3.5
Gain on sale of business			0.0
Operating income	197.5	192.8	596.4	548.8
Nonoperating Income (Expense)	(1.9)	(0.9)	18.3	(14.0)
Income (loss) before income taxes	195.6	191.9	614.7	534.8
Income tax expense (benefit)	12.4	16.9	22.7	35.8
Earnings from equity in subsidiaries	0.0	0.0	0.0	0.0
Net income (loss) before royalties	183.2	175.0	592.0	499.0
Royalties	(88.3)	(86.2)	(259.4)	(256.2)
Net income after royalties	94.9	88.8	332.6	242.8
Net income attributable to noncontrolling interests	(0.2)	(0.1)	(0.5)	(0.2)
Net income attributable to AAM	94.7	88.7	332.1	242.6
Other comprehensive income, net of tax	0.0	51.3	(37.3)	94.8
Comprehensive income attributable to AAM	94.7	140.0	294.8	337.4
Consolidation, Eliminations [Member]
Net sales
External	0.0	0.0	0.0	0.0
Intercompany	(87.1)	(87.2)	(266.7)	(237.0)
Revenues	(87.1)	(87.2)	(266.7)	(237.0)
Cost of goods sold	(87.1)	(87.2)	(266.7)	(237.0)
Gross profit	0.0	0.0	0.0	0.0
Selling, general and administrative expenses	0.0	0.0	0.0	0.0
Amortization of intangible assets	0.0	0.0	0.0	0.0
Restructuring and acquisition-related costs	0.0	0.0	0.0	0.0
Gain on sale of business			0.0
Operating income	0.0	0.0	0.0	0.0
Nonoperating Income (Expense)	0.0	0.0	0.0	0.0
Income (loss) before income taxes	0.0	0.0	0.0	0.0
Income tax expense (benefit)	0.0	0.0	0.0	0.0
Earnings from equity in subsidiaries	(165.7)	(141.6)	(687.5)	(475.1)
Net income (loss) before royalties	(165.7)	(141.6)	(687.5)	(475.1)
Royalties	0.0	0.0	0.0	0.0
Net income after royalties	(165.7)	(141.6)	(687.5)	(475.1)
Net income attributable to noncontrolling interests	0.0	0.0	0.0	0.0
Net income attributable to AAM	(165.7)	(141.6)	(687.5)	(475.1)
Other comprehensive income, net of tax	9.3	(110.6)	90.4	(224.8)
Comprehensive income attributable to AAM	$ (156.4)	$ (252.2)	$ (597.1)	$ (699.9)

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