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Supplemental Guarantor Condensed Consolidating Statements of Cash Flows (Details) (USD $)
In Millions, unless otherwise specified
 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Net cash provided by (used in) operating activities $ 24.6 $ 116.5
Investing activities    
Purchases of property, plant and equipment (92.9) (71.6)
Proceeds from sale of property, plant and equipment 1.2 7.8
Net cash used in investing activities (91.7) (63.8)
Financing activities    
Net debt activity (7.3) (47.4)
Intercompany activity 0 0
Payments of Debt Issuance Costs 0 (5.3)
Employee stock option exercises 0.1 4.6
Purchase of noncontrolling interest (4.0)  
Purchase of treasury stock (5.9) (0.1)
Net cash used in financing activities (17.1) (48.2)
Effect of exchange rate changes on cash 0.2 1.2
Net increase (decrease) in cash and cash equivalents (84.0) 5.7
Cash and cash equivalents at beginning of period 169.2 244.6
Cash and cash equivalents at end of period 85.2 250.3
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
Employee stock option exercises 0 0
Purchase of noncontrolling interest 0  
Purchase of treasury stock (5.9) (0.1)
Net cash used in 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 (51.9) 0.2
Investing activities    
Purchases of property, plant and equipment (25.2) (16.5)
Proceeds from sale of property, plant and equipment 0.4 1.4
Net cash used in investing activities (24.8) (15.1)
Financing activities    
Net debt activity (1.7) 0
Intercompany activity 17.0 10.0
Payments of Debt Issuance Costs   (5.3)
Employee stock option exercises 0.1 4.6
Purchase of noncontrolling interest 0  
Purchase of treasury stock 0 0
Net cash used in financing activities 15.4 9.3
Effect of exchange rate changes on cash 0 0
Net increase (decrease) in cash and cash equivalents (61.3) (5.6)
Cash and cash equivalents at beginning of period 83.7 67.6
Cash and cash equivalents at end of period 22.4 62.0
Guarantor Subsidiaries of Certain Notes [Member]
    
Net cash provided by (used in) operating activities 32.4 27.9
Investing activities    
Purchases of property, plant and equipment (4.2) (1.8)
Proceeds from sale of property, plant and equipment 0 0.1
Net cash used in investing activities (4.2) (1.7)
Financing activities    
Net debt activity (0.1) (0.1)
Intercompany activity (28.1) (26.1)
Payments of Debt Issuance Costs   0
Employee stock option exercises 0 0
Purchase of noncontrolling interest 0  
Purchase of treasury stock 0 0
Net cash used in financing activities (28.2) (26.2)
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 44.1 88.4
Investing activities    
Purchases of property, plant and equipment (63.5) (53.3)
Proceeds from sale of property, plant and equipment 0.8 6.3
Net cash used in investing activities (62.7) (47.0)
Financing activities    
Net debt activity (5.5) (4.4)
Intercompany activity 5.2 (26.9)
Payments of Debt Issuance Costs   0
Employee stock option exercises 0 0
Purchase of noncontrolling interest (4.0)  
Purchase of treasury stock 0 0
Net cash used in financing activities (4.3) (31.3)
Effect of exchange rate changes on cash 0.2 1.2
Net increase (decrease) in cash and cash equivalents (22.7) 11.3
Cash and cash equivalents at beginning of period 85.5 177.0
Cash and cash equivalents at end of period 62.8 188.3
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
Employee stock option exercises 0 0
Purchase of noncontrolling interest 0  
Purchase of treasury stock 0 0
Net cash used in 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