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Supplemental Guarantor Condensed Consolidating Balance Sheets (Details) (USD $) In Millions, unless otherwise specified | Jun. 30, 2012 | Dec. 31, 2011 | Jun. 30, 2011 | Dec. 31, 2010
--- | --- | --- | --- | ---
Cash and cash equivalents | $ 85.2 | $ 169.2 | $ 250.3 | $ 244.6
Accounts receivable, net | 474.2 | 333.3 |  |
Inventories, net | 208.5 | 177.2 |  |
Other assets, current | 93.7 | 83.4 |  |
Total current assets | 861.6 | 763.1 |  |
Property, plant and equipment, net | 990.3 | 971.2 |  |
Goodwill | 155.9 | 155.9 |  |
Other assets, noncurrent, condensed | 433.4 | 438.5 |  |
Equity method investments | 0 | 0 |  |
Total assets | 2,441.2 | 2,328.7 |  |
Accounts payable | 439.6 | 337.1 |  |
Other liabilities, current, condensed | 252.3 | 239.0 |  |
Total current liabilities | 691.9 | 576.1 |  |
Intercompany payable (receivable) | 0 | 0 |  |
Long-term debt | 1,174.3 | 1,180.2 |  |
Investment in subsidiaries obligation | 0 | 0 |  |
Other liabilities, noncurrent | 969.7 | 992.0 |  |
Total liabilities | 2,835.9 | 2,748.3 |  |
Total AAM stockholders' deficit | (394.7) | (425.5) |  |
Noncontrolling interest in subsidiaries | 0 | 5.9 |  |
Total stockholders’ deficit | (394.7) | (419.6) |  |
Total liabilities and stockholders' deficit | 2,441.2 | 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 | 68.1 | 104.8 |  |
Other liabilities, noncurrent | 0 | 0 |  |
Total liabilities | 394.7 | 425.5 |  |
Total AAM stockholders' deficit | (394.7) | (425.5) |  |
Noncontrolling interest in subsidiaries | 0 | 0 |  |
Total stockholders’ deficit | (394.7) | (425.5) |  |
Total liabilities and stockholders' deficit | 0 | 0 |  |
AAM Inc. [Member] |  |  |  |
Cash and cash equivalents | 22.4 | 83.7 | 62.0 | 67.6
Accounts receivable, net | 106.2 | 77.1 |  |
Inventories, net | 43.6 | 48.2 |  |
Other assets, current | 22.5 | 26.5 |  |
Total current assets | 194.7 | 235.5 |  |
Property, plant and equipment, net | 261.6 | 260.4 |  |
Goodwill | 0 | 0 |  |
Other assets, noncurrent, condensed | 318.0 | 327.2 |  |
Equity method investments | 1,109.5 | 1,015.2 |  |
Total assets | 1,883.8 | 1,838.3 |  |
Accounts payable | 103.9 | 96.3 |  |
Other liabilities, current, condensed | 162.2 | 155.1 |  |
Total current liabilities | 266.1 | 251.4 |  |
Intercompany payable (receivable) | (350.4) | (368.6) |  |
Long-term debt | 1,129.2 | 1,128.9 |  |
Investment in subsidiaries obligation | 0 | 0 |  |
Other liabilities, noncurrent | 907.0 | 931.4 |  |
Total liabilities | 1,951.9 | 1,943.1 |  |
Total AAM stockholders' deficit | (68.1) | (104.8) |  |
Noncontrolling interest in subsidiaries | 0 | 0 |  |
Total stockholders’ deficit | (68.1) | (104.8) |  |
Total liabilities and stockholders' deficit | 1,883.8 | 1,838.3 |  |
Guarantor Subsidiaries of Certain Notes [Member] |  |  |  |
Cash and cash equivalents | 0 | 0 | 0 | 0
Accounts receivable, net | 28.0 | 23.3 |  |
Inventories, net | 30.6 | 35.3 |  |
Other assets, current | 1.4 | 1.7 |  |
Total current assets | 60.0 | 60.3 |  |
Property, plant and equipment, net | 83.7 | 84.6 |  |
Goodwill | 147.8 | 147.8 |  |
Other assets, noncurrent, condensed | 38.5 | 35.8 |  |
Equity method investments | 4.6 | 26.6 |  |
Total assets | 334.6 | 355.1 |  |
Accounts payable | 45.8 | 41.0 |  |
Other liabilities, current, condensed | 3.8 | 3.0 |  |
Total current liabilities | 49.6 | 44.0 |  |
Intercompany payable (receivable) | 270.9 | 289.0 |  |
Long-term debt | 5.8 | 5.9 |  |
Investment in subsidiaries obligation | 0 | 0 |  |
Other liabilities, noncurrent | 3.6 | 3.6 |  |
Total liabilities | 329.9 | 342.5 |  |
Total AAM stockholders' deficit | 4.7 | 12.6 |  |
Noncontrolling interest in subsidiaries | 0 | 0 |  |
Total stockholders’ deficit | 4.7 | 12.6 |  |
Total liabilities and stockholders' deficit | 334.6 | 355.1 |  |
Non-Guarantor Subsidiaries [Member] |  |  |  |
Cash and cash equivalents | 62.8 | 85.5 | 188.3 | 177.0
Accounts receivable, net | 340.0 | 232.9 |  |
Inventories, net | 134.3 | 93.7 |  |
Other assets, current | 69.8 | 55.2 |  |
Total current assets | 606.9 | 467.3 |  |
Property, plant and equipment, net | 645.0 | 626.2 |  |
Goodwill | 8.1 | 8.1 |  |
Other assets, noncurrent, condensed | 76.9 | 75.5 |  |
Equity method investments | 0 | 0 |  |
Total assets | 1,336.9 | 1,177.1 |  |
Accounts payable | 289.9 | 199.8 |  |
Other liabilities, current, condensed | 86.3 | 80.9 |  |
Total current liabilities | 376.2 | 280.7 |  |
Intercompany payable (receivable) | (247.1) | (241.1) |  |
Long-term debt | 39.3 | 45.4 |  |
Investment in subsidiaries obligation | 0 | 0 |  |
Other liabilities, noncurrent | 59.1 | 57.0 |  |
Total liabilities | 227.5 | 142.0 |  |
Total AAM stockholders' deficit | 1,109.4 | 1,029.2 |  |
Noncontrolling interest in subsidiaries | 0 | 5.9 |  |
Total stockholders’ deficit | 1,109.4 | 1,035.1 |  |
Total liabilities and stockholders' deficit | 1,336.9 | 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 | (1,114.1) | (1,041.8) |  |
Total assets | (1,114.1) | (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 | (68.1) | (104.8) |  |
Other liabilities, noncurrent | 0 | 0 |  |
Total liabilities | (68.1) | (104.8) |  |
Total AAM stockholders' deficit | (1,046.0) | (937.0) |  |
Noncontrolling interest in subsidiaries | 0 | 0 |  |
Total stockholders’ deficit | (1,046.0) | (937.0) |  |
Total liabilities and stockholders' deficit | $ (1,114.1) | $ (1,041.8) |  |

X
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