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Supplemental Guarantor Condensed Consolidating Financial Statements 2012 and 2011 Cash Flow Statements (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Net Cash Provided by (Used in) Operating Activities | $ (175.5) | $ (56.3) | $ 240.3
Investing activities |  |  |
Purchases of property, plant and equipment | (207.6) | (163.1) | (108.3)
Proceeds from sale of property, plant and equipment | 10.1 | 8.9 | 4.9
Sale Leaseback Transaction, Net Proceeds | 12.1 | 0 | 0
Purchase buyouts of leased equipment | 0 | (13.4) | (7.8)
Acquisition, net |  | (16.5) | (2.2)
Redemption of short-term investments | 0 | 0 | 6.4
Net cash used in investing activities | (185.4) | (184.1) | (107.0)
Financing Activities |  |  |
Net debt activity | 273.9 | 173.6 | (61.9)
Intercompany Activity | 0 | 0 | 0
Debt issuance costs | (10.6) | (10.9) | (2.2)
Employee stock option exercises, including tax benefit | 0.1 | 4.6 | 1.1
Purchase of treasury stock | (5.9) | (0.1) | (1.3)
Purchase of noncontrolling interest | (4.0) | 0 | (2.1)
Net cash provided by (used in) financing activities | 253.5 | 167.2 | (66.4)
Effect of Exchange Rate on Cash and Cash Equivalents | 0.6 | (2.2) | (0.4)
Net increase (decrease) in cash and cash equivalents | (106.8) | (75.4) | 66.5
Cash and cash equivalents at beginning of year | 169.2 | 244.6 | 178.1
Cash and cash equivalents at end of year | 62.4 | 169.2 | 244.6
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
Sale Leaseback Transaction, Net Proceeds | 0 |  |
Purchase buyouts of leased equipment |  | 0 | 0
Acquisition, net |  | 0 | 0
Redemption of short-term investments |  |  | 0
Net cash used in investing activities | 0 | 0 | 0
Financing Activities |  |  |
Net debt activity | 0 | 0 | 0
Intercompany Activity | 5.9 | 0.1 | 1.3
Debt issuance costs | 0 | 0 | 0
Employee stock option exercises, including tax benefit | 0 | 0 | 0
Purchase of treasury stock | (5.9) | (0.1) | (1.3)
Purchase of noncontrolling interest | 0 |  | 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 | (228.2) | (119.3) | (5.9)
Investing activities |  |  |
Purchases of property, plant and equipment | (59.4) | (43.9) | (30.8)
Proceeds from sale of property, plant and equipment | 7.0 | 1.5 | 1.7
Sale Leaseback Transaction, Net Proceeds | 12.1 |  |
Purchase buyouts of leased equipment |  | (13.4) | (7.8)
Acquisition, net |  | 0 | 0
Redemption of short-term investments |  |  | 1.6
Net cash used in investing activities | (40.3) | (55.8) | (35.3)
Financing Activities |  |  |
Net debt activity | 257.9 | 159.6 | (59.2)
Intercompany Activity | (52.0) | 37.9 | 88.5
Debt issuance costs | (10.6) | (10.9) | (2.2)
Employee stock option exercises, including tax benefit | 0.1 | 4.6 | 1.1
Purchase of treasury stock | 0 | 0 | 0
Purchase of noncontrolling interest | 0 |  | 0
Net cash provided by (used in) financing activities | 195.4 | 191.2 | 28.2
Effect of Exchange Rate on Cash and Cash Equivalents | 0 | 0 | 0
Net increase (decrease) in cash and cash equivalents | (73.1) | 16.1 | (13.0)
Cash and cash equivalents at beginning of year | 83.7 | 67.6 | 80.6
Cash and cash equivalents at end of year | 10.6 | 83.7 | 67.6
Guarantor Subsidiaries of Certain Notes [Member] |  |  |
Net Cash Provided by (Used in) Operating Activities | 56.8 | 40.1 | 40.3
Investing activities |  |  |
Purchases of property, plant and equipment | (9.0) | (4.9) | (6.2)
Proceeds from sale of property, plant and equipment | 0 | 0 | 0
Sale Leaseback Transaction, Net Proceeds | 0 |  |
Purchase buyouts of leased equipment |  | 0 | 0
Acquisition, net |  | (16.5) | 0
Redemption of short-term investments |  |  | 0
Net cash used in investing activities | (9.0) | (21.4) | (6.2)
Financing Activities |  |  |
Net debt activity | (0.2) | (0.2) | (0.2)
Intercompany Activity | (47.6) | (18.5) | (33.7)
Debt issuance costs | 0 | 0 | 0
Employee stock option exercises, including tax benefit | 0 | 0 | 0
Purchase of treasury stock | 0 | 0 | 0
Purchase of noncontrolling interest | 0 |  | (2.1)
Net cash provided by (used in) financing activities | (47.8) | (18.7) | (36.0)
Effect of Exchange Rate on Cash and Cash Equivalents | 0 | 0 | 0
Net increase (decrease) in cash and cash equivalents | 0 | 0 | (1.9)
Cash and cash equivalents at beginning of year | 0 | 0 | 1.9
Cash and cash equivalents at end of year | 0 | 0 | 0
Non-Guarantor Subsidiaries [Member] |  |  |
Net Cash Provided by (Used in) Operating Activities | (4.1) | 22.9 | 205.9
Investing activities |  |  |
Purchases of property, plant and equipment | (139.2) | (114.3) | (71.3)
Proceeds from sale of property, plant and equipment | 3.1 | 7.4 | 3.2
Sale Leaseback Transaction, Net Proceeds | 0 |  |
Purchase buyouts of leased equipment |  | 0 | 0
Acquisition, net |  | 0 | (2.2)
Redemption of short-term investments |  |  | 4.8
Net cash used in investing activities | (136.1) | (106.9) | (65.5)
Financing Activities |  |  |
Net debt activity | 16.2 | 14.2 | (2.5)
Intercompany Activity | 93.7 | (19.5) | (56.1)
Debt issuance costs | 0 | 0 | 0
Employee stock option exercises, including tax benefit | 0 | 0 | 0
Purchase of treasury stock | 0 | 0 | 0
Purchase of noncontrolling interest | (4.0) |  | 0
Net cash provided by (used in) financing activities | 105.9 | (5.3) | (58.6)
Effect of Exchange Rate on Cash and Cash Equivalents | 0.6 | (2.2) | (0.4)
Net increase (decrease) in cash and cash equivalents | (33.7) | (91.5) | 81.4
Cash and cash equivalents at beginning of year | 85.5 | 177.0 | 95.6
Cash and cash equivalents at end of year | 51.8 | 85.5 | 177.0
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
Sale Leaseback Transaction, Net Proceeds | 0 |  |
Purchase buyouts of leased equipment |  | 0 | 0
Acquisition, net |  | 0 | 0
Redemption of short-term investments |  |  | 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
Purchase of noncontrolling interest | 0 |  | 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 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 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 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 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 4: 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 + 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 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 2: 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 3: 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 4: 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 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 Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The gross proceeds received from the asset(s) sold in connection with the transaction involving the sale of property to another party and the lease of the property back to the seller less the costs incurred in connection with the transaction, such as closing and deferred financing costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 98 -Section Appendix A -Paragraph 28, 29 -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 Statement of Financial Accounting Standard (FAS) -Number 13 -Paragraph 33 -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 Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=9155692&loc=d3e51843-112757 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 55 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=9155692&loc=d3e51831-112757 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 55 -Paragraph 51 -URI http://asc.fasb.org/extlink&oid=9155692&loc=d3e51840-112757 + Details
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