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Supplemental Guarantor Condensed Consolidating Financial Statements 2011 and 2010 Cash Flow Statements (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Net Cash Provided by (Used in) Operating Activities | $ (56.3) | $ 240.3 | $ 15.9
Investing activities |  |  |
Purchases of property, plant and equipment | (163.1) | (108.3) | (137.7)
Proceeds from sale of property, plant and equipment | 8.9 | 4.9 | 1.7
Purchase buyouts of leased equipment | (13.4) | (7.8) | 0
Acquisition, net | (16.5) | (2.2) | (10.2)
Redemption of short-term investments | 0 | 6.4 | 71.6
Net cash used in investing activities | (184.1) | (107.0) | (74.6)
Financing Activities |  |  |
Net debt activity | 173.6 | (61.9) | (75.1)
Intercompany Activity | 0 | 0 | 0
Debt issuance costs | (10.9) | (2.2) | (32.9)
Employee stock option exercises, including tax benefit | 4.6 | 1.1 | 1.0
Purchase of treasury stock | (0.1) | (1.3) | (0.9)
Proceeds from issuance of common stock, net | 0 | 0 | 109.7
Proceeds from issuance of warrants to GM | 0 | 0 | 30.3
Purchase of noncontrolling interest | 0 | (2.1) | 0
Net cash provided by (used in) financing activities | 167.2 | (66.4) | 32.1
Effect of Exchange Rate on Cash and Cash Equivalents | (2.2) | (0.4) | 5.9
Net increase (decrease) in cash and cash equivalents | (75.4) | 66.5 | (20.7)
Cash and cash equivalents at beginning of year | 244.6 | 178.1 | 198.8
Cash and cash equivalents at end of year | 169.2 | 244.6 | 178.1
Holdings [Member] |  |  |
Net Cash Provided by (Used in) Operating Activities | 0 | 0 | 0
Investing activities |  |  |
Purchases of property, plant and equipment | 0 | 0 | 0
Proceeds from sale of property, plant and equipment | 0 | 0 | 0
Purchase buyouts of leased equipment | 0 | 0 |
Acquisition, net | 0 | 0 | 0
Redemption of short-term investments |  | 0 | 0
Net cash used in investing activities | 0 | 0 | 0
Financing Activities |  |  |
Net debt activity | 0 | 0 | 0
Intercompany Activity | 0.1 | 1.3 | (139.1)
Debt issuance costs | 0 | 0 | 0
Employee stock option exercises, including tax benefit | 0 | 0 | 0
Purchase of treasury stock | (0.1) | (1.3) | (0.9)
Proceeds from issuance of common stock, net |  |  | 109.7
Proceeds from issuance of warrants to GM |  |  | 30.3
Purchase of noncontrolling interest |  | 0 |
Net cash provided by (used in) financing activities | 0 | 0 | 0
Effect of Exchange Rate on Cash and Cash Equivalents | 0 | 0 | 0
Net increase (decrease) in cash and cash equivalents | 0 | 0 | 0
Cash and cash equivalents at beginning of year | 0 | 0 | 0
Cash and cash equivalents at end of year | 0 | 0 | 0
AAM Inc. [Member] |  |  |
Net Cash Provided by (Used in) Operating Activities | (119.3) | (5.9) | (160.1)
Investing activities |  |  |
Purchases of property, plant and equipment | (43.9) | (30.8) | (55.3)
Proceeds from sale of property, plant and equipment | 1.5 | 1.7 | 1.4
Purchase buyouts of leased equipment | (13.4) | (7.8) |
Acquisition, net | 0 | 0 | 0
Redemption of short-term investments |  | 1.6 | 7.9
Net cash used in investing activities | (55.8) | (35.3) | (46.0)
Financing Activities |  |  |
Net debt activity | 159.6 | (59.2) | (65.4)
Intercompany Activity | 37.9 | 88.5 | 329.4
Debt issuance costs | (10.9) | (2.2) | (32.9)
Employee stock option exercises, including tax benefit | 4.6 | 1.1 | 1.0
Purchase of treasury stock | 0 | 0 | 0
Proceeds from issuance of common stock, net |  |  | 0
Proceeds from issuance of warrants to GM |  |  | 0
Purchase of noncontrolling interest |  | 0 |
Net cash provided by (used in) financing activities | 191.2 | 28.2 | 232.1
Effect of Exchange Rate on Cash and Cash Equivalents | 0 | 0 | 0
Net increase (decrease) in cash and cash equivalents | 16.1 | (13.0) | 26.0
Cash and cash equivalents at beginning of year | 67.6 | 80.6 | 54.6
Cash and cash equivalents at end of year | 83.7 | 67.6 | 80.6
Guarantor Subsidiaries of Certain Notes [Member] |  |  |
Net Cash Provided by (Used in) Operating Activities | 40.1 | 40.3 | 15.6
Investing activities |  |  |
Purchases of property, plant and equipment | (4.9) | (6.2) | (26.3)
Proceeds from sale of property, plant and equipment | 0 | 0 | 0.3
Purchase buyouts of leased equipment | 0 | 0 |
Acquisition, net | (16.5) | 0 | (10.2)
Redemption of short-term investments |  | 0 | 0
Net cash used in investing activities | (21.4) | (6.2) | (36.2)
Financing Activities |  |  |
Net debt activity | (0.2) | (0.2) | (0.2)
Intercompany Activity | (18.5) | (33.7) | 22.7
Debt issuance costs | 0 | 0 | 0
Employee stock option exercises, including tax benefit | 0 | 0 | 0
Purchase of treasury stock | 0 | 0 | 0
Proceeds from issuance of common stock, net |  |  | 0
Proceeds from issuance of warrants to GM |  |  | 0
Purchase of noncontrolling interest |  | (2.1) |
Net cash provided by (used in) financing activities | (18.7) | (36.0) | 22.5
Effect of Exchange Rate on Cash and Cash Equivalents | 0 | 0 | 0
Net increase (decrease) in cash and cash equivalents | 0 | (1.9) | 1.9
Cash and cash equivalents at beginning of year | 0 | 1.9 | 0
Cash and cash equivalents at end of year | 0 | 0 | 1.9
Non-Guarantor Subsidiaries [Member] |  |  |
Net Cash Provided by (Used in) Operating Activities | 22.9 | 205.9 | 160.4
Investing activities |  |  |
Purchases of property, plant and equipment | (114.3) | (71.3) | (56.1)
Proceeds from sale of property, plant and equipment | 7.4 | 3.2 | 0
Purchase buyouts of leased equipment | 0 | 0 |
Acquisition, net | 0 | (2.2) | 0
Redemption of short-term investments |  | 4.8 | 63.7
Net cash used in investing activities | (106.9) | (65.5) | 7.6
Financing Activities |  |  |
Net debt activity | 14.2 | (2.5) | (9.5)
Intercompany Activity | (19.5) | (56.1) | (213.0)
Debt issuance costs | 0 | 0 | 0
Employee stock option exercises, including tax benefit | 0 | 0 | 0
Purchase of treasury stock | 0 | 0 | 0
Proceeds from issuance of common stock, net |  |  | 0
Proceeds from issuance of warrants to GM |  |  | 0
Purchase of noncontrolling interest |  | 0 |
Net cash provided by (used in) financing activities | (5.3) | (58.6) | (222.5)
Effect of Exchange Rate on Cash and Cash Equivalents | (2.2) | (0.4) | 5.9
Net increase (decrease) in cash and cash equivalents | (91.5) | 81.4 | (48.6)
Cash and cash equivalents at beginning of year | 177.0 | 95.6 | 144.2
Cash and cash equivalents at end of year | 85.5 | 177.0 | 95.6
Consolidation, Eliminations [Member] |  |  |
Net Cash Provided by (Used in) Operating Activities | 0 | 0 | 0
Investing activities |  |  |
Purchases of property, plant and equipment | 0 | 0 | 0
Proceeds from sale of property, plant and equipment | 0 | 0 | 0
Purchase buyouts of leased equipment | 0 | 0 |
Acquisition, net | 0 | 0 | 0
Redemption of short-term investments |  | 0 | 0
Net cash used in investing activities | 0 | 0 | 0
Financing Activities |  |  |
Net debt activity | 0 | 0 | 0
Intercompany Activity | 0 | 0 | 0
Debt issuance costs | 0 | 0 | 0
Employee stock option exercises, including tax benefit | 0 | 0 | 0
Purchase of treasury stock | 0 | 0 | 0
Proceeds from issuance of common stock, net |  |  | 0
Proceeds from issuance of warrants to GM |  |  | 0
Purchase of noncontrolling interest |  | 0 |
Net cash provided by (used in) financing activities | 0 | 0 | 0
Effect of Exchange Rate on Cash and Cash Equivalents | 0 | 0 | 0
Net increase (decrease) in cash and cash equivalents | 0 | 0 | 0
Cash and cash equivalents at beginning of year | 0 | 0 | 0
Cash and cash equivalents at end of year | $ 0 | $ 0 | $ 0

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- Definition The net cash from (used in) all of the entity's operating activities, including those of discontinued operations, of the reporting entity. Operating activities generally involve producing and delivering goods and providing services. Operating activity cash flows include transactions, adjustments, and changes in value that are not defined as investing or financing activities. While for technical reasons this element has no balance attribute, the default assumption is a debit balance consistent with its label. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3536-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 26 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 + Details
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- Definition The cash outflow to reacquire common stock during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 20 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15, 17 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3213-108585 + Details
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- Definition The cash inflow from the additional capital contribution to the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3255-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 19 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition The cash inflow from issuance of rights to purchase common shares at predetermined price (usually issued together with corporate debt). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3255-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 19 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition The net cash inflow or outflow in aggregate debt due to repayments and proceeds from additional borrowings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3179-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 16 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 + Details
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- Definition The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph i -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3255-108585 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 19 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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