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Supplemental Guarantor Condensed Consolidating Financial Statements - Condensed Consolidating Balance Sheets (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Current assets |  |  |
Cash and cash equivalents | $ 532.0 | $ 476.4 |
Accounts receivable, net | 815.4 | 966.5 |
Intercompany receivables | 0.0 | 0.0 |
Inventories, net | 373.6 | 459.7 |
Other current assets | 136.8 | 127.2 |
Total current assets | 1,857.8 | 2,029.8 |
Property, plant and equipment, net | 2,358.4 | 2,514.4 |
Goodwill | 699.1 | 1,141.8 | $ 1,654.3
Other intangible assets, net | 864.5 | 1,111.1 |
Intercompany notes and accounts receivable | 0.0 | 0.0 |
Other assets and deferred charges | 864.8 | 713.6 |
Investment in subsidiaries | 0.0 | 0.0 |
Total assets | 6,644.6 | 7,510.7 | $ 7,882.8
Current liabilities |  |  |
Current portion of long-term debt | 28.7 | 121.6 |
Accounts payable | 623.5 | 840.2 |
Intercompany payables | 0.0 | 0.0 |
Other current liabilities | 374.2 | 395.0 |
Total current liabilities | 1,026.4 | 1,356.8 |
Intercompany notes and accounts payable | 0.0 | 0.0 |
Long-term debt, net | 3,612.3 | 3,686.8 |
Other long-term liabilities | 1,025.5 | 980.8 |
Total liabilities | 5,664.2 | 6,024.4 |
Total AAM stockholders' equity | 977.6 | 1,483.9 |
Noncontrolling interests in subsidiaries | 2.8 | 2.4 |
Total stockholders' equity | 980.4 | 1,486.3 |
Total liabilities and stockholders' equity | 6,644.6 | 7,510.7 |
Consolidation, Eliminations [Member] |  |  |
Current assets |  |  |
Cash and cash equivalents | 0.0 | 0.0 |
Accounts receivable, net | 0.0 | 0.0 |
Intercompany receivables | (8,750.5) | (5,787.0) |
Inventories, net | 0.0 | 0.0 |
Other current assets | 0.0 | 0.0 |
Total current assets | (8,750.5) | (5,787.0) |
Property, plant and equipment, net | 0.0 | 0.0 |
Goodwill | 0.0 | 0.0 |
Other intangible assets, net | 0.0 | 0.0 |
Intercompany notes and accounts receivable | (1,990.6) | (1,461.3) |
Other assets and deferred charges | 0.0 | 0.0 |
Investment in subsidiaries | (5,558.9) | (6,780.7) |
Total assets | (16,300.0) | (14,029.0) |
Current liabilities |  |  |
Current portion of long-term debt | 0.0 | 0.0 |
Accounts payable | 0.0 | 0.0 |
Intercompany payables | (8,750.5) | (5,787.0) |
Other current liabilities | 0.0 | 0.0 |
Total current liabilities | (8,750.5) | (5,787.0) |
Intercompany notes and accounts payable | (1,990.6) | (1,461.3) |
Long-term debt, net | 0.0 | 0.0 |
Other long-term liabilities | 0.0 | 0.0 |
Total liabilities | (10,741.1) | (7,248.3) |
Total AAM stockholders' equity | (5,556.1) | (6,778.3) |
Noncontrolling interests in subsidiaries | (2.8) | (2.4) |
Total stockholders' equity | (5,558.9) | (6,780.7) |
Total liabilities and stockholders' equity | (16,300.0) | (14,029.0) |
Holdings [Member] |  |  |
Current assets |  |  |
Cash and cash equivalents | 0.0 | 0.0 |
Accounts receivable, net | 0.0 | 0.0 |
Intercompany receivables | 0.0 | 0.0 |
Inventories, net | 0.0 | 0.0 |
Other current assets | 0.0 | 0.0 |
Total current assets | 0.0 | 0.0 |
Property, plant and equipment, net | 0.0 | 0.0 |
Goodwill | 0.0 | 0.0 |
Other intangible assets, net | 0.0 | 0.0 |
Intercompany notes and accounts receivable | 0.0 | 0.0 |
Other assets and deferred charges | 0.0 | 0.0 |
Investment in subsidiaries | 2,294.0 | 2,790.5 |
Total assets | 2,294.0 | 2,790.5 |
Current liabilities |  |  |
Current portion of long-term debt | 0.0 | 0.0 |
Accounts payable | 0.0 | 0.0 |
Intercompany payables | 0.0 | 0.0 |
Other current liabilities | 0.0 | 0.0 |
Total current liabilities | 0.0 | 0.0 |
Intercompany notes and accounts payable | 1,313.6 | 1,304.2 |
Long-term debt, net | 0.0 | 0.0 |
Other long-term liabilities | 0.0 | 0.0 |
Total liabilities | 1,313.6 | 1,304.2 |
Total AAM stockholders' equity | 977.6 | 1,483.9 |
Noncontrolling interests in subsidiaries | 2.8 | 2.4 |
Total stockholders' equity | 980.4 | 1,486.3 |
Total liabilities and stockholders' equity | 2,294.0 | 2,790.5 |
AAM Inc. [Member] |  |  |
Current assets |  |  |
Cash and cash equivalents | 168.7 | 36.7 |
Accounts receivable, net | 87.1 | 122.7 |
Intercompany receivables | 4,603.4 | 3,337.2 |
Inventories, net | 36.6 | 42.5 |
Other current assets | 47.6 | 34.4 |
Total current assets | 4,943.4 | 3,573.5 |
Property, plant and equipment, net | 287.3 | 275.8 |
Goodwill | 0.0 | 0.0 |
Other intangible assets, net | 18.1 | 18.6 |
Intercompany notes and accounts receivable | 1,829.2 | 1,316.8 |
Other assets and deferred charges | 408.3 | 319.8 |
Investment in subsidiaries | 1,773.3 | 2,241.5 |
Total assets | 9,259.6 | 7,746.0 |
Current liabilities |  |  |
Current portion of long-term debt | 4.2 | 100.0 |
Accounts payable | 85.2 | 94.2 |
Intercompany payables | 3,652.1 | 2,050.0 |
Other current liabilities | 158.8 | 169.0 |
Total current liabilities | 3,900.3 | 2,413.2 |
Intercompany notes and accounts payable | 11.5 | 12.5 |
Long-term debt, net | 3,523.4 | 3,578.3 |
Other long-term liabilities | 475.4 | 508.9 |
Total liabilities | 7,910.6 | 6,512.9 |
Total AAM stockholders' equity | 1,349.0 | 1,233.1 |
Noncontrolling interests in subsidiaries | 0.0 | 0.0 |
Total stockholders' equity | 1,349.0 | 1,233.1 |
Total liabilities and stockholders' equity | 9,259.6 | 7,746.0 |
Guarantor Subsidiaries [Member] |  |  |
Current assets |  |  |
Cash and cash equivalents | 0.2 | 0.2 |
Accounts receivable, net | 176.4 | 287.7 |
Intercompany receivables | 4,024.5 | 2,356.3 |
Inventories, net | 114.1 | 157.7 |
Other current assets | 4.2 | 6.0 |
Total current assets | 4,319.4 | 2,807.9 |
Property, plant and equipment, net | 543.9 | 758.6 |
Goodwill | 377.9 | 719.0 |
Other intangible assets, net | 817.9 | 1,059.6 |
Intercompany notes and accounts receivable | 161.4 | 144.5 |
Other assets and deferred charges | 123.8 | 126.4 |
Investment in subsidiaries | 1,491.6 | 1,748.7 |
Total assets | 7,835.9 | 7,364.7 |
Current liabilities |  |  |
Current portion of long-term debt | 7.4 | 0.0 |
Accounts payable | 142.7 | 246.5 |
Intercompany payables | 5,033.8 | 3,615.7 |
Other current liabilities | 31.0 | 35.8 |
Total current liabilities | 5,214.9 | 3,898.0 |
Intercompany notes and accounts payable | 98.9 | 0.0 |
Long-term debt, net | 0.0 | 3.0 |
Other long-term liabilities | 282.5 | 271.7 |
Total liabilities | 5,596.3 | 4,172.7 |
Total AAM stockholders' equity | 2,239.6 | 3,192.0 |
Noncontrolling interests in subsidiaries | 0.0 | 0.0 |
Total stockholders' equity | 2,239.6 | 3,192.0 |
Total liabilities and stockholders' equity | 7,835.9 | 7,364.7 |
Non-Guarantor Subsidiaries [Member] |  |  |
Current assets |  |  |
Cash and cash equivalents | 363.1 | 439.5 |
Accounts receivable, net | 551.9 | 556.1 |
Intercompany receivables | 122.6 | 93.5 |
Inventories, net | 222.9 | 259.5 |
Other current assets | 85.0 | 86.8 |
Total current assets | 1,345.5 | 1,435.4 |
Property, plant and equipment, net | 1,527.2 | 1,480.0 |
Goodwill | 321.2 | 422.8 |
Other intangible assets, net | 28.5 | 32.9 |
Intercompany notes and accounts receivable | 0.0 | 0.0 |
Other assets and deferred charges | 332.7 | 267.4 |
Investment in subsidiaries | 0.0 | 0.0 |
Total assets | 3,555.1 | 3,638.5 |
Current liabilities |  |  |
Current portion of long-term debt | 17.1 | 21.6 |
Accounts payable | 395.6 | 499.5 |
Intercompany payables | 64.6 | 121.3 |
Other current liabilities | 184.4 | 190.2 |
Total current liabilities | 661.7 | 832.6 |
Intercompany notes and accounts payable | 566.6 | 144.6 |
Long-term debt, net | 88.9 | 105.5 |
Other long-term liabilities | 267.6 | 200.2 |
Total liabilities | 1,584.8 | 1,282.9 |
Total AAM stockholders' equity | 1,967.5 | 2,353.2 |
Noncontrolling interests in subsidiaries | 2.8 | 2.4 |
Total stockholders' equity | 1,970.3 | 2,355.6 |
Total liabilities and stockholders' equity | $ 3,555.1 | $ 3,638.5 |

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