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Supplemental Guarantor Condensed Consolidating Statements of Cash Flows (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Net cash provided by (used in) operating activities $ (71.5) $ 1.0
Investing activities    
Purchases of property, plant and equipment (44.5) (31.5)
Proceeds from sale of property, plant and equipment 0.9 1.5
Net cash used in investing activities (43.6) (30.0)
Financing activities    
Net debt activity 66.8 (3.3)
Intercompany activity 0 0
Employee stock option exercises 0.1 4.6
Purchase of noncontrolling interest (4.0) 0
Purchase of treasury stock (5.9) (0.1)
Net cash provided by financing activities 57.0 1.2
Effect of exchange rate changes on cash 1.7 0.6
Net increase (decrease) in cash and cash equivalents (56.4) (27.2)
Cash and cash equivalents at beginning of period 169.2 244.6
Cash and cash equivalents at end of period 112.8 217.4
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 (0.4)
Intercompany activity 5.9 0.5
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 (73.8) (33.8)
Investing activities    
Purchases of property, plant and equipment (14.7) (9.7)
Proceeds from sale of property, plant and equipment 0.1 0.9
Net cash used in investing activities (14.6) (8.8)
Financing activities    
Net debt activity 59.1 0
Intercompany activity (24.3) 51.3
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 34.9 55.9
Effect of exchange rate changes on cash 0 0
Net increase (decrease) in cash and cash equivalents (53.5) 13.3
Cash and cash equivalents at beginning of period 83.7 67.6
Cash and cash equivalents at end of period 30.2 80.9
Guarantor Subsidiaries of Certain Notes [Member]
    
Net cash provided by (used in) operating activities 7.5 1.0
Investing activities    
Purchases of property, plant and equipment (1.4) (0.6)
Proceeds from sale of property, plant and equipment 0 0
Net cash used in investing activities (1.4) (0.6)
Financing activities    
Net debt activity (0.1) (0.1)
Intercompany activity (6.0) (0.3)
Employee stock option exercises 0 0
Purchase of noncontrolling interest 0  
Purchase of treasury stock 0 0
Net cash provided by financing activities (6.1) (0.4)
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 (5.2) 33.8
Investing activities    
Purchases of property, plant and equipment (28.4) (21.2)
Proceeds from sale of property, plant and equipment 0.8 0.6
Net cash used in investing activities (27.6) (20.6)
Financing activities    
Net debt activity 7.8 (2.8)
Intercompany activity 24.4 (51.5)
Employee stock option exercises 0 0
Purchase of noncontrolling interest (4.0)  
Purchase of treasury stock 0 0
Net cash provided by financing activities 28.2 (54.3)
Effect of exchange rate changes on cash 1.7 0.6
Net increase (decrease) in cash and cash equivalents (2.9) (40.5)
Cash and cash equivalents at beginning of period 85.5 177.0
Cash and cash equivalents at end of period 82.6 136.5
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
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