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Supplemental Guarantor Condensed Consolidating Balance Sheets (Details) (USD $) In Millions, unless otherwise specified | Sep. 30, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Dec. 31, 2010
--- | --- | --- | --- | ---
Cash and cash equivalents | $ 209.0 | $ 169.2 | $ 114.4 | $ 244.6
Accounts receivable, net | 465.3 | 333.3 |  |
Inventories, net | 242.3 | 177.2 |  |
Other assets, current | 105.5 | 83.4 |  |
Total current assets | 1,022.1 | 763.1 |  |
Property, plant and equipment, net | 1,007.6 | 971.2 |  |
Goodwill | 156.3 | 155.9 |  |
Other assets, noncurrent, condensed | 488.2 | 438.5 |  |
Equity method investments | 0 | 0 |  |
Total assets | 2,674.2 | 2,328.7 |  |
Accounts payable | 429.5 | 337.1 |  |
Other liabilities, current, condensed | 220.3 | 239.0 |  |
Total current liabilities | 649.8 | 576.1 |  |
Intercompany payable (receivable) | 0 | 0 |  |
Long-term debt | 1,579.9 | 1,180.2 |  |
Investment in subsidiaries obligation | 0 | 0 |  |
Other liabilities, noncurrent | 942.2 | 992.0 |  |
Total liabilities | 3,171.9 | 2,748.3 |  |
Total AAM stockholders' deficit | (497.7) | (425.5) |  |
Noncontrolling interest in subsidiaries | 0 | 5.9 |  |
Total stockholders’ deficit | (497.7) | (419.6) |  |
Total liabilities and stockholders' deficit | 2,674.2 | 2,328.7 |  |
Holdings [Member] |  |  |  |
Cash and cash equivalents | 0 | 0 | 0 | 0
Accounts receivable, net | 0 | 0 |  |
Inventories, net | 0 | 0 |  |
Other assets, current | 0 | 0 |  |
Total current assets | 0 | 0 |  |
Property, plant and equipment, net | 0 | 0 |  |
Goodwill | 0 | 0 |  |
Other assets, noncurrent, condensed | 0 | 0 |  |
Equity method investments | 0 | 0 |  |
Total assets | 0 | 0 |  |
Accounts payable | 0 | 0 |  |
Other liabilities, current, condensed | 0 | 0 |  |
Total current liabilities | 0 | 0 |  |
Intercompany payable (receivable) | 326.6 | 320.7 |  |
Long-term debt | 0 | 0 |  |
Investment in subsidiaries obligation | 171.1 | 104.8 |  |
Other liabilities, noncurrent | 0 | 0 |  |
Total liabilities | 497.7 | 425.5 |  |
Total AAM stockholders' deficit | (497.7) | (425.5) |  |
Noncontrolling interest in subsidiaries | 0 | 0 |  |
Total stockholders’ deficit | (497.7) | (425.5) |  |
Total liabilities and stockholders' deficit | 0 | 0 |  |
AAM Inc. [Member] |  |  |  |
Cash and cash equivalents | 151.8 | 83.7 | 40.9 | 67.6
Accounts receivable, net | 84.9 | 77.1 |  |
Inventories, net | 51.2 | 48.2 |  |
Other assets, current | 32.1 | 26.5 |  |
Total current assets | 320.0 | 235.5 |  |
Property, plant and equipment, net | 258.4 | 260.4 |  |
Goodwill | 0 | 0 |  |
Other assets, noncurrent, condensed | 360.8 | 327.2 |  |
Equity method investments | 1,151.0 | 1,015.2 |  |
Total assets | 2,090.2 | 1,838.3 |  |
Accounts payable | 95.9 | 96.3 |  |
Other liabilities, current, condensed | 128.1 | 155.1 |  |
Total current liabilities | 224.0 | 251.4 |  |
Intercompany payable (receivable) | (392.4) | (368.6) |  |
Long-term debt | 1,541.6 | 1,128.9 |  |
Investment in subsidiaries obligation | 0 | 0 |  |
Other liabilities, noncurrent | 888.1 | 931.4 |  |
Total liabilities | 2,261.3 | 1,943.1 |  |
Total AAM stockholders' deficit | (171.1) | (104.8) |  |
Noncontrolling interest in subsidiaries | 0 | 0 |  |
Total stockholders’ deficit | (171.1) | (104.8) |  |
Total liabilities and stockholders' deficit | 2,090.2 | 1,838.3 |  |
Guarantor Subsidiaries of Certain Notes [Member] |  |  |  |
Cash and cash equivalents | 0 | 0 | 0 | 0
Accounts receivable, net | 30.9 | 23.3 |  |
Inventories, net | 33.1 | 35.3 |  |
Other assets, current | 1.7 | 1.7 |  |
Total current assets | 65.7 | 60.3 |  |
Property, plant and equipment, net | 84.3 | 84.6 |  |
Goodwill | 147.8 | 147.8 |  |
Other assets, noncurrent, condensed | 39.4 | 35.8 |  |
Equity method investments | 4.3 | 26.6 |  |
Total assets | 341.5 | 355.1 |  |
Accounts payable | 47.4 | 41.0 |  |
Other liabilities, current, condensed | 3.8 | 3.0 |  |
Total current liabilities | 51.2 | 44.0 |  |
Intercompany payable (receivable) | 275.2 | 289.0 |  |
Long-term debt | 5.7 | 5.9 |  |
Investment in subsidiaries obligation | 0 | 0 |  |
Other liabilities, noncurrent | 3.6 | 3.6 |  |
Total liabilities | 335.7 | 342.5 |  |
Total AAM stockholders' deficit | 5.8 | 12.6 |  |
Noncontrolling interest in subsidiaries | 0 | 0 |  |
Total stockholders’ deficit | 5.8 | 12.6 |  |
Total liabilities and stockholders' deficit | 341.5 | 355.1 |  |
Non-Guarantor Subsidiaries [Member] |  |  |  |
Cash and cash equivalents | 57.2 | 85.5 | 73.5 | 177.0
Accounts receivable, net | 349.5 | 232.9 |  |
Inventories, net | 158.0 | 93.7 |  |
Other assets, current | 71.7 | 55.2 |  |
Total current assets | 636.4 | 467.3 |  |
Property, plant and equipment, net | 664.9 | 626.2 |  |
Goodwill | 8.5 | 8.1 |  |
Other assets, noncurrent, condensed | 88.0 | 75.5 |  |
Equity method investments | 0 | 0 |  |
Total assets | 1,397.8 | 1,177.1 |  |
Accounts payable | 286.2 | 199.8 |  |
Other liabilities, current, condensed | 88.4 | 80.9 |  |
Total current liabilities | 374.6 | 280.7 |  |
Intercompany payable (receivable) | (209.4) | (241.1) |  |
Long-term debt | 32.6 | 45.4 |  |
Investment in subsidiaries obligation | 0 | 0 |  |
Other liabilities, noncurrent | 50.5 | 57.0 |  |
Total liabilities | 248.3 | 142.0 |  |
Total AAM stockholders' deficit | 1,149.5 | 1,029.2 |  |
Noncontrolling interest in subsidiaries | 0 | 5.9 |  |
Total stockholders’ deficit | 1,149.5 | 1,035.1 |  |
Total liabilities and stockholders' deficit | 1,397.8 | 1,177.1 |  |
Consolidation, Eliminations [Member] |  |  |  |
Cash and cash equivalents | 0 | 0 | 0 | 0
Accounts receivable, net | 0 | 0 |  |
Inventories, net | 0 | 0 |  |
Other assets, current | 0 | 0 |  |
Total current assets | 0 | 0 |  |
Property, plant and equipment, net | 0 | 0 |  |
Goodwill | 0 | 0 |  |
Other assets, noncurrent, condensed | 0 | 0 |  |
Equity method investments | (1,155.3) | (1,041.8) |  |
Total assets | (1,155.3) | (1,041.8) |  |
Accounts payable | 0 | 0 |  |
Other liabilities, current, condensed | 0 | 0 |  |
Total current liabilities | 0 | 0 |  |
Intercompany payable (receivable) | 0 | 0 |  |
Long-term debt | 0 | 0 |  |
Investment in subsidiaries obligation | (171.1) | (104.8) |  |
Other liabilities, noncurrent | 0 | 0 |  |
Total liabilities | (171.1) | (104.8) |  |
Total AAM stockholders' deficit | (984.2) | (937.0) |  |
Noncontrolling interest in subsidiaries | 0 | 0 |  |
Total stockholders’ deficit | (984.2) | (937.0) |  |
Total liabilities and stockholders' deficit | $ (1,155.3) | $ (1,041.8) |  |

X
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