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Goodwill and Other Intangibles - Goodwill (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Changes in the carrying amount of goodwill    
Net goodwill balance, January 1 $ 1,186.2  
Ending balance, December 31 1,181.4  
Goodwill impairment test, weighted average cost of capital discount rate for future cash flow 10.00%  
Sensitivity analysis Increase in discount rate 1.00%  
Sensitivity analysis decrease in operating margin assumption 1.00%  
Engine [Member]
   
Changes in the carrying amount of goodwill    
Gross goodwill balance, January 1 1,334.7 1,351.9
Accumulated impairment losses, January 1 (501.8) (501.8)
Net goodwill balance, January 1 832.9 850.1
Acquisition 0 0 [1]
Divestitures (16.9) (7.9) [1]
Translation adjustment 6.3 (9.3)
Ending balance, December 31 822.3 832.9
Drivetrain [Member]
   
Changes in the carrying amount of goodwill    
Gross goodwill balance, January 1 353.5 263.6
Accumulated impairment losses, January 1 (0.2) (0.2)
Net goodwill balance, January 1 353.3 263.4
Acquisition 0 96.2 [1]
Divestitures 0 0 [1]
Translation adjustment 5.8 (6.3)
Ending balance, December 31 $ 359.1 $ 353.3
[1] Goodwill acquired relates to the 2011 purchase of Haldex Traction AB. Goodwill divested relates to the Company's 2011 sale of the tire pressure monitoring business and 2012 sale of the spark plug business.