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Supplemental Guarantor Condensed Consolidating Financial Statements - Condensed Consolidating Statements of Income (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Net sales |  |  |
External | $ 6,530.9 | $ 7,270.4 | $ 6,266.0
Intercompany | 0.0 | 0.0 | 0.0
Total net sales | 6,530.9 | 7,270.4 | 6,266.0
Cost of goods sold | 5,628.3 | 6,130.0 | 5,146.9
Gross profit | 902.6 | 1,140.4 | 1,119.1
Selling, general and administrative expenses | 364.7 | 385.7 | 390.1
Amortization of intangible assets | 95.4 | 99.4 | 75.3
Impairment charges | 665.0 | 485.5 | 0.0
Restructuring and acquisition-related costs | 57.8 | 78.9 | 110.7
(Gain) loss on sale of business | 21.3 | (15.5) | 0.0
Operating income (loss) | (301.6) | 106.4 | 543.0
Non-operating income (expense), net | (231.4) | (220.3) | (203.0)
Income (loss) before income taxes | (533.0) | (113.9) | 340.0
Income tax expense (benefit) | (48.9) | (57.1) | 2.5
Earnings (loss) from equity in subsidiaries | 0.0 | 0.0 | 0.0
Net income (loss) before royalties | (484.1) | (56.8) | 337.5
Royalties | 0.0 | 0.0 | 0.0
Net income (loss) after royalties | (484.1) | (56.8) | 337.5
Net income attributable to noncontrolling interests | (0.4) | (0.7) | (0.4)
Net income (loss) attributable to AAM | (484.5) | (57.5) | 337.1
Other comprehensive income (loss), net of tax | (37.5) | (18.9) | 96.9
Comprehensive income (loss) | (522.0) | (76.4) | 434.0
Consolidation, Eliminations [Member] |  |  |
Net sales |  |  |
External | 0.0 | 0.0 | 0.0
Intercompany | (324.3) | (340.9) | (315.1)
Total net sales | (324.3) | (340.9) | (315.1)
Cost of goods sold | (324.3) | (340.9) | (315.1)
Gross profit | 0.0 | 0.0 | 0.0
Selling, general and administrative expenses | 0.0 | 0.0 | 0.0
Amortization of intangible assets | 0.0 | 0.0 | 0.0
Impairment charges | 0.0 | 0.0 |
Restructuring and acquisition-related costs | 0.0 | 0.0 | 0.0
(Gain) loss on sale of business | 0.0 | 0.0 |
Operating income (loss) | 0.0 | 0.0 | 0.0
Non-operating income (expense), net | 0.0 | 0.0 | 0.0
Income (loss) before income taxes | 0.0 | 0.0 | 0.0
Income tax expense (benefit) | 0.0 | 0.0 | 0.0
Earnings (loss) from equity in subsidiaries | 688.3 | 57.8 | (702.7)
Net income (loss) before royalties | 688.3 | 57.8 | (702.7)
Royalties | 0.0 | 0.0 | 0.0
Net income (loss) after royalties | 688.3 | 57.8 | (702.7)
Net income attributable to noncontrolling interests | 0.0 | 0.0 | 0.0
Net income (loss) attributable to AAM | 688.3 | 57.8 | (702.7)
Other comprehensive income (loss), net of tax | 58.7 | 86.4 | (230.0)
Comprehensive income (loss) | 747.0 | 144.2 | (932.7)
Holdings [Member] |  |  |
Net sales |  |  |
External | 0.0 | 0.0 | 0.0
Intercompany | 0.0 | 0.0 | 0.0
Total net sales | 0.0 | 0.0 | 0.0
Cost of goods sold | 0.0 | 0.0 | 0.0
Gross profit | 0.0 | 0.0 | 0.0
Selling, general and administrative expenses | 0.0 | 0.0 | 0.0
Amortization of intangible assets | 0.0 | 0.0 | 0.0
Impairment charges | 0.0 | 0.0 |
Restructuring and acquisition-related costs | 0.0 | 0.0 | 0.0
(Gain) loss on sale of business | 0.0 | 0.0 |
Operating income (loss) | 0.0 | 0.0 | 0.0
Non-operating income (expense), net | 0.0 | 0.0 | 0.0
Income (loss) before income taxes | 0.0 | 0.0 | 0.0
Income tax expense (benefit) | 0.0 | 0.0 | 0.0
Earnings (loss) from equity in subsidiaries | (484.5) | (57.5) | 337.1
Net income (loss) before royalties | (484.5) | (57.5) | 337.1
Royalties | 0.0 | 0.0 | 0.0
Net income (loss) after royalties | (484.5) | (57.5) | 337.1
Net income attributable to noncontrolling interests | 0.0 | 0.0 | 0.0
Net income (loss) attributable to AAM | (484.5) | (57.5) | 337.1
Other comprehensive income (loss), net of tax | (37.5) | (18.9) | 96.9
Comprehensive income (loss) | (522.0) | (76.4) | 434.0
AAM Inc. [Member] |  |  |
Net sales |  |  |
External | 902.0 | 1,088.4 | 1,074.6
Intercompany | 1.9 | 4.2 | 2.4
Total net sales | 903.9 | 1,092.6 | 1,077.0
Cost of goods sold | 913.2 | 1,033.8 | 996.6
Gross profit | (9.3) | 58.8 | 80.4
Selling, general and administrative expenses | 232.5 | 210.3 | 223.2
Amortization of intangible assets | 5.9 | 5.1 | 5.6
Impairment charges | 0.0 | 0.0 |
Restructuring and acquisition-related costs | 24.3 | 34.2 | 105.2
(Gain) loss on sale of business | 0.0 | 0.0 |
Operating income (loss) | (272.0) | (190.8) | (253.6)
Non-operating income (expense), net | (247.0) | (260.6) | (210.0)
Income (loss) before income taxes | (519.0) | (451.4) | (463.6)
Income tax expense (benefit) | (76.5) | (34.2) | 194.1
Earnings (loss) from equity in subsidiaries | (218.3) | (168.3) | 289.5
Net income (loss) before royalties | (660.8) | (585.5) | (368.2)
Royalties | 224.4 | 276.6 | 317.3
Net income (loss) after royalties | (436.4) | (308.9) | (50.9)
Net income attributable to noncontrolling interests | 0.0 | 0.0 | 0.0
Net income (loss) attributable to AAM | (436.4) | (308.9) | (50.9)
Other comprehensive income (loss), net of tax | (28.3) | 9.4 | 40.1
Comprehensive income (loss) | (464.7) | (299.5) | (10.8)
Guarantor Subsidiaries [Member] |  |  |
Net sales |  |  |
External | 1,992.0 | 2,204.8 | 1,668.2
Intercompany | 274.7 | 294.8 | 285.2
Total net sales | 2,266.7 | 2,499.6 | 1,953.4
Cost of goods sold | 2,065.4 | 2,249.0 | 1,730.9
Gross profit | 201.3 | 250.6 | 222.5
Selling, general and administrative expenses | 27.7 | 81.4 | 63.9
Amortization of intangible assets | 85.8 | 90.8 | 67.5
Impairment charges | 566.1 | 485.5 |
Restructuring and acquisition-related costs | 21.7 | 40.4 | 1.9
(Gain) loss on sale of business | 21.3 | (15.5) |
Operating income (loss) | (521.3) | (432.0) | 89.2
Non-operating income (expense), net | 7.7 | 15.6 | 18.6
Income (loss) before income taxes | (513.6) | (416.4) | 107.8
Income tax expense (benefit) | (10.7) | (55.4) | (247.0)
Earnings (loss) from equity in subsidiaries | 14.5 | 168.0 | 76.1
Net income (loss) before royalties | (488.4) | (193.0) | 430.9
Royalties | 3.0 | 3.4 | 3.6
Net income (loss) after royalties | (485.4) | (189.6) | 434.5
Net income attributable to noncontrolling interests | 0.0 | 0.0 | 0.0
Net income (loss) attributable to AAM | (485.4) | (189.6) | 434.5
Other comprehensive income (loss), net of tax | (18.3) | (51.6) | 87.3
Comprehensive income (loss) | (503.7) | (241.2) | 521.8
Non-Guarantor Subsidiaries [Member] |  |  |
Net sales |  |  |
External | 3,636.9 | 3,977.2 | 3,523.2
Intercompany | 47.7 | 41.9 | 27.5
Total net sales | 3,684.6 | 4,019.1 | 3,550.7
Cost of goods sold | 2,974.0 | 3,188.1 | 2,734.5
Gross profit | 710.6 | 831.0 | 816.2
Selling, general and administrative expenses | 104.5 | 94.0 | 103.0
Amortization of intangible assets | 3.7 | 3.5 | 2.2
Impairment charges | 98.9 | 0.0 |
Restructuring and acquisition-related costs | 11.8 | 4.3 | 3.6
(Gain) loss on sale of business | 0.0 | 0.0 |
Operating income (loss) | 491.7 | 729.2 | 707.4
Non-operating income (expense), net | 7.9 | 24.7 | (11.6)
Income (loss) before income taxes | 499.6 | 753.9 | 695.8
Income tax expense (benefit) | 38.3 | 32.5 | 55.4
Earnings (loss) from equity in subsidiaries | 0.0 | 0.0 | 0.0
Net income (loss) before royalties | 461.3 | 721.4 | 640.4
Royalties | (227.4) | (280.0) | (320.9)
Net income (loss) after royalties | 233.9 | 441.4 | 319.5
Net income attributable to noncontrolling interests | (0.4) | (0.7) | (0.4)
Net income (loss) attributable to AAM | 233.5 | 440.7 | 319.1
Other comprehensive income (loss), net of tax | (12.1) | (44.2) | 102.6
Comprehensive income (loss) | $ 221.4 | $ 396.5 | $ 421.7

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