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Supplemental Guarantor Condensed Consolidating Financial Statements 2010 and 2009 Income Statements (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Net sales                      
External                 $ 2,585.0 $ 2,283.0 $ 1,521.6
Intercompany                 0 0 0
Total net sales 605.6 647.6 686.2 645.6 583.3 618.2 559.6 521.9 2,585.0 2,283.0 1,521.6
Cost of Goods Sold                 2,129.9 1,881.3 1,552.7
Gross profit (loss) 105.7 103.5 130.5 115.4 101.6 113.9 98.9 87.3 455.1 401.7 (31.1)
Selling, general and administrative expenses                 231.7 197.6 172.7
Operating income (loss)                 223.4 204.1 (203.8)
Non-operating income (expense), net                 (85.3) (85.3) (93.3)
Income (loss) before income taxes                 138.1 118.8 (297.1)
Income Tax Expense (Benefit)                 1.0 4.3 (43.8)
Earnings (loss) from equity in subsidiaries                 0 0 0
Net Income (Loss) Before Royalties and Dividends                 137.1 114.5 (253.3)
Royalties and Dividends                 0 0 0
Net Income (Loss) After Royalties and Dividends                 137.1 114.5 (253.3)
Net Income (Loss) Attributable to Noncontrolling Interest                 5.7 0.9 0.2
Net income (loss) attributable to AAM 31.1 24.8 49.2 37.7 34.9 38.8 25.4 16.3 142.8 115.4 (253.1)
Holdings [Member]
                      
Net sales                      
External                 0 0 0
Intercompany                 0 0 0
Total net sales                 0 0 0
Cost of Goods Sold                 0 0 0
Gross profit (loss)                 0 0 0
Selling, general and administrative expenses                 0 0 0
Operating income (loss)                 0 0 0
Non-operating income (expense), net                 0 0 0
Income (loss) before income taxes                 0 0 0
Income Tax Expense (Benefit)                 0 0 0
Earnings (loss) from equity in subsidiaries                 142.8 115.4 (253.1)
Net Income (Loss) Before Royalties and Dividends                 142.8 115.4 (253.1)
Royalties and Dividends                 0 0 0
Net Income (Loss) After Royalties and Dividends                 142.8 115.4 (253.1)
Net Income (Loss) Attributable to Noncontrolling Interest                 0 0 0
Net income (loss) attributable to AAM                 142.8 115.4 (253.1)
AAM Inc. [Member]
                      
Net sales                      
External                 777.7 623.6 514.5
Intercompany                 25.1 26.0 25.4
Total net sales                 802.8 649.6 539.9
Cost of Goods Sold                 727.0 601.1 656.7
Gross profit (loss)                 75.8 48.5 (116.8)
Selling, general and administrative expenses                 192.0 177.8 163.0
Operating income (loss)                 (116.2) (129.3) (279.8)
Non-operating income (expense), net                 (91.8) (88.6) (95.5)
Income (loss) before income taxes                 (208.0) (217.9) (375.3)
Income Tax Expense (Benefit)                 (5.2) 1.5 (59.5)
Earnings (loss) from equity in subsidiaries                 165.5 152.5 17.5
Net Income (Loss) Before Royalties and Dividends                 (37.3) (66.9) (298.3)
Royalties and Dividends                 180.1 182.3 45.2
Net Income (Loss) After Royalties and Dividends                 142.8 115.4 (253.1)
Net Income (Loss) Attributable to Noncontrolling Interest                 0 0 0
Net income (loss) attributable to AAM                 142.8 115.4 (253.1)
Guarantor Subsidiaries of Certain Notes [Member]
                      
Net sales                      
External                 195.3 186.7 142.3
Intercompany                 189.8 160.9 92.9
Total net sales                 385.1 347.6 235.2
Cost of Goods Sold                 334.2 323.9 271.8
Gross profit (loss)                 50.9 23.7 (36.6)
Selling, general and administrative expenses                 0 0 0
Operating income (loss)                 50.9 23.7 (36.6)
Non-operating income (expense), net                 1.0 0.3 2.9
Income (loss) before income taxes                 51.9 24.0 (33.7)
Income Tax Expense (Benefit)                 1.2 0.3 0.2
Earnings (loss) from equity in subsidiaries                 (37.7) (26.8) (49.9)
Net Income (Loss) Before Royalties and Dividends                 13.0 (3.1) (83.8)
Royalties and Dividends                 0 0 0
Net Income (Loss) After Royalties and Dividends                 13.0 (3.1) (83.8)
Net Income (Loss) Attributable to Noncontrolling Interest                 0 0 0
Net income (loss) attributable to AAM                 13.0 (3.1) (83.8)
Non-Guarantor Subsidiaries [Member]
                      
Net sales                      
External                 1,612.0 1,472.7 864.8
Intercompany                 12.7 14.8 12.3
Total net sales                 1,624.7 1,487.5 877.1
Cost of Goods Sold                 1,296.3 1,158.0 754.8
Gross profit (loss)                 328.4 329.5 122.3
Selling, general and administrative expenses                 39.7 19.8 9.7
Operating income (loss)                 288.7 309.7 112.6
Non-operating income (expense), net                 5.5 3.0 (0.7)
Income (loss) before income taxes                 294.2 312.7 111.9
Income Tax Expense (Benefit)                 5.0 2.5 15.5
Earnings (loss) from equity in subsidiaries                 0 0 0
Net Income (Loss) Before Royalties and Dividends                 289.2 310.2 96.4
Royalties and Dividends                 (180.1) (182.3) (45.2)
Net Income (Loss) After Royalties and Dividends                 109.1 127.9 51.2
Net Income (Loss) Attributable to Noncontrolling Interest                 5.7 0.9 0.2
Net income (loss) attributable to AAM                 114.8 128.8 51.4
Consolidation, Eliminations [Member]
                      
Net sales                      
External                 0 0 0
Intercompany                 (227.6) (201.7) (130.6)
Total net sales                 (227.6) (201.7) (130.6)
Cost of Goods Sold                 (227.6) (201.7) (130.6)
Gross profit (loss)                 0 0 0
Selling, general and administrative expenses                 0 0 0
Operating income (loss)                 0 0 0
Non-operating income (expense), net                 0 0 0
Income (loss) before income taxes                 0 0 0
Income Tax Expense (Benefit)                 0 0 0
Earnings (loss) from equity in subsidiaries                 (270.6) (241.1) 285.5
Net Income (Loss) Before Royalties and Dividends                 (270.6) (241.1) 285.5
Royalties and Dividends                 0 0 0
Net Income (Loss) After Royalties and Dividends                 (270.6) (241.1) 285.5
Net Income (Loss) Attributable to Noncontrolling Interest                 0 0 0
Net income (loss) attributable to AAM                 $ (270.6) $ (241.1) $ 285.5