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Supplemental Guarantor Condensed Consolidating Statements of Cash Flows (Details) (USD $) In Millions, unless otherwise specified | 9 Months Ended
--- | ---
Sep. 30, 2012 | Sep. 30, 2011
Net cash provided by (used in) operating activities | $ (196.6) | $ (65.4)
Investing activities |  |
Purchases of property, plant and equipment | (143.7) | (111.0)
Proceeds from sale of property, plant and equipment | 2.2 | 7.9
Net cash used in investing activities | (141.5) | (103.1)
Financing activities |  |
Net debt activity | 397.0 | 40.6
Intercompany activity | 0 | 0
Payments of Debt Issuance Costs | (10.1) | (5.7)
Employee stock option exercises | 0.1 | 4.6
Purchase of noncontrolling interest | (4.0) |
Purchase of treasury stock | (5.9) | (0.1)
Net cash provided by financing activities | 377.1 | 39.4
Effect of exchange rate changes on cash | 0.8 | (1.1)
Net increase (decrease) in cash and cash equivalents | 39.8 | (130.2)
Cash and cash equivalents at beginning of period | 169.2 | 244.6
Cash and cash equivalents at end of period | 209.0 | 114.4
Holdings [Member] |  |
Net cash provided by (used in) operating activities | 0 | 0
Investing activities |  |
Purchases of property, plant and equipment | 0 | 0
Proceeds from sale of property, plant and equipment | 0 | 0
Net cash used in investing activities | 0 | 0
Financing activities |  |
Net debt activity | 0 | (42.9)
Intercompany activity | 5.9 | 43.0
Payments of Debt Issuance Costs | 0 | 0
Employee stock option exercises | 0 | 0
Purchase of noncontrolling interest | 0 |
Purchase of treasury stock | (5.9) | (0.1)
Net cash provided by financing activities | 0 | 0
Effect of exchange rate changes on cash | 0 | 0
Net increase (decrease) in cash and cash equivalents | 0 | 0
Cash and cash equivalents at beginning of period | 0 | 0
Cash and cash equivalents at end of period | 0 | 0
AAM Inc. [Member] |  |
Net cash provided by (used in) operating activities | (276.8) | (106.1)
Investing activities |  |
Purchases of property, plant and equipment | (36.2) | (25.9)
Proceeds from sale of property, plant and equipment | 0.5 | 1.5
Net cash used in investing activities | (35.7) | (24.4)
Financing activities |  |
Net debt activity | 409.6 | 70.0
Intercompany activity | (19.0) | 34.9
Payments of Debt Issuance Costs | (10.1) | (5.7)
Employee stock option exercises | 0.1 | 4.6
Purchase of noncontrolling interest | 0 |
Purchase of treasury stock | 0 | 0
Net cash provided by financing activities | 380.6 | 103.8
Effect of exchange rate changes on cash | 0 | 0
Net increase (decrease) in cash and cash equivalents | 68.1 | (26.7)
Cash and cash equivalents at beginning of period | 83.7 | 67.6
Cash and cash equivalents at end of period | 151.8 | 40.9
Guarantor Subsidiaries of Certain Notes [Member] |  |
Net cash provided by (used in) operating activities | 42.3 | 35.5
Investing activities |  |
Purchases of property, plant and equipment | (6.2) | (3.5)
Proceeds from sale of property, plant and equipment | 0 | 0.1
Net cash used in investing activities | (6.2) | (3.4)
Financing activities |  |
Net debt activity | (0.2) | (0.2)
Intercompany activity | (35.9) | (31.9)
Payments of Debt Issuance Costs | 0 | 0
Employee stock option exercises | 0 | 0
Purchase of noncontrolling interest | 0 |
Purchase of treasury stock | 0 | 0
Net cash provided by financing activities | (36.1) | (32.1)
Effect of exchange rate changes on cash | 0 | 0
Net increase (decrease) in cash and cash equivalents | 0 | 0
Cash and cash equivalents at beginning of period | 0 | 0
Cash and cash equivalents at end of period | 0 | 0
Non-Guarantor Subsidiaries [Member] |  |
Net cash provided by (used in) operating activities | 37.9 | 5.2
Investing activities |  |
Purchases of property, plant and equipment | (101.3) | (81.6)
Proceeds from sale of property, plant and equipment | 1.7 | 6.3
Net cash used in investing activities | (99.6) | (75.3)
Financing activities |  |
Net debt activity | (12.4) | 13.7
Intercompany activity | 49.0 | (46.0)
Payments of Debt Issuance Costs | 0 | 0
Employee stock option exercises | 0 | 0
Purchase of noncontrolling interest | (4.0) |
Purchase of treasury stock | 0 | 0
Net cash provided by financing activities | 32.6 | (32.3)
Effect of exchange rate changes on cash | 0.8 | (1.1)
Net increase (decrease) in cash and cash equivalents | (28.3) | (103.5)
Cash and cash equivalents at beginning of period | 85.5 | 177.0
Cash and cash equivalents at end of period | 57.2 | 73.5
Consolidation, Eliminations [Member] |  |
Net cash provided by (used in) operating activities | 0 | 0
Investing activities |  |
Purchases of property, plant and equipment | 0 | 0
Proceeds from sale of property, plant and equipment | 0 | 0
Net cash used in investing activities | 0 | 0
Financing activities |  |
Net debt activity | 0 | 0
Intercompany activity | 0 | 0
Payments of Debt Issuance Costs | 0 | 0
Employee stock option exercises | 0 | 0
Purchase of noncontrolling interest | 0 |
Purchase of treasury stock | 0 | 0
Net cash provided by financing activities | 0 | 0
Effect of exchange rate changes on cash | 0 | 0
Net increase (decrease) in cash and cash equivalents | 0 | 0
Cash and cash equivalents at beginning of period | 0 | 0
Cash and cash equivalents at end of period | $ 0 | $ 0

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