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Supplemental Guarantor Condensed Consolidating Statements of Cash Flows (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012
Net cash provided by (used in) operating activities | $ (26.8) | $ (71.5)
Investing activities |  |
Purchases of property, plant and equipment | (47.9) | (44.5)
Proceeds from sale of property, plant and equipment | 0.1 | 0.9
Proceeds from sale-leaseback of equipment | 3.9 | 0
Net cash used in investing activities | (43.9) | (43.6)
Financing Activities |  |
Net debt activity | 114.7 | 66.8
Intercompany activity | 0 | 0
Debt issuance costs | (6.2) | 0
Employee stock option exercises | 0 | 0.1
Purchase of noncontrolling interest | 0 | (4.0)
Purchase of treasury stock | 0 | (5.9)
Net cash provided by financing activities | 108.5 | 57.0
Effect of exchange rate changes on cash | 0.6 | 1.7
Net increase (decrease) in cash and cash equivalents | 38.4 | (56.4)
Cash and cash equivalents | 100.8 | 112.8
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
Proceeds from sale-leaseback of equipment | 0 |
Net cash used in investing activities | 0 | 0
Financing Activities |  |
Net debt activity | 0 | 0
Intercompany activity | 0 | 5.9
Debt issuance costs | 0 |
Employee stock option exercises |  | 0
Purchase of noncontrolling interest |  | 0
Purchase of treasury stock |  | (5.9)
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 | 0 | 0
AAM Inc. [Member] |  |
Net cash provided by (used in) operating activities | (42.1) | (73.8)
Investing activities |  |
Purchases of property, plant and equipment | (13.3) | (14.7)
Proceeds from sale of property, plant and equipment | 0.1 | 0.1
Proceeds from sale-leaseback of equipment | 3.9 |
Net cash used in investing activities | (9.3) | (14.6)
Financing Activities |  |
Net debt activity | 99.0 | 59.1
Intercompany activity | (22.7) | (24.3)
Debt issuance costs | (6.2) |
Employee stock option exercises |  | 0.1
Purchase of noncontrolling interest |  | 0
Purchase of treasury stock |  | 0
Net cash provided by financing activities | 70.1 | 34.9
Effect of exchange rate changes on cash | 0 | 0
Net increase (decrease) in cash and cash equivalents | 18.7 | (53.5)
Cash and cash equivalents | 29.3 | 30.2
Guarantor Subsidiaries [Member] |  |
Net cash provided by (used in) operating activities | (2.0) | 7.5
Investing activities |  |
Purchases of property, plant and equipment | (2.2) | (1.4)
Proceeds from sale of property, plant and equipment | 0 | 0
Proceeds from sale-leaseback of equipment | 0 |
Net cash used in investing activities | (2.2) | (1.4)
Financing Activities |  |
Net debt activity | (0.1) | (0.1)
Intercompany activity | 4.3 | (6.0)
Debt issuance costs | 0 |
Employee stock option exercises |  | 0
Purchase of noncontrolling interest |  | 0
Purchase of treasury stock |  | 0
Net cash provided by financing activities | 4.2 | (6.1)
Effect of exchange rate changes on cash | 0 | 0
Net increase (decrease) in cash and cash equivalents | 0 | 0
Cash and cash equivalents | 0 | 0
Non-Guarantor Subsidiaries [Member] |  |
Net cash provided by (used in) operating activities | 17.3 | (5.2)
Investing activities |  |
Purchases of property, plant and equipment | (32.4) | (28.4)
Proceeds from sale of property, plant and equipment | 0 | 0.8
Proceeds from sale-leaseback of equipment | 0 |
Net cash used in investing activities | (32.4) | (27.6)
Financing Activities |  |
Net debt activity | 15.8 | 7.8
Intercompany activity | 18.4 | 24.4
Debt issuance costs | 0 |
Employee stock option exercises |  | 0
Purchase of noncontrolling interest |  | (4.0)
Purchase of treasury stock |  | 0
Net cash provided by financing activities | 34.2 | 28.2
Effect of exchange rate changes on cash | 0.6 | 1.7
Net increase (decrease) in cash and cash equivalents | 19.7 | (2.9)
Cash and cash equivalents | 71.5 | 82.6
Elims [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
Proceeds from sale-leaseback of equipment | 0 |
Net cash used in investing activities | 0 | 0
Financing Activities |  |
Net debt activity | 0 | 0
Intercompany activity | 0 | 0
Debt issuance costs | 0 |
Employee stock option exercises |  | 0
Purchase of noncontrolling interest |  | 0
Purchase of treasury stock |  | 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 | $ 0 | $ 0

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