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New Senior Secured Credit Facilities Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Apr. 06, 2017
Jun. 30, 2017
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Debt Instrument [Line Items]          
Proceeds from Issuance of Long-term Debt     $ 2,857.9 $ 29.6  
Payments of Debt Issuance Costs     $ 90.5 $ 0.0  
Line of Credit Facility, Interest Rate Description     The Term Loan A Facility and the Revolving Credit Facility will mature on April 6, 2022, and the Term Loan B Facility will mature on April 6, 2024. Borrowings under the New Senior Secured Credit Facilities bear interest at rates based on the applicable Eurodollar rate or alternate base rate, as AAM may elect, in each case plus an applicable margin determined based on AAM’s total net leverage ratio. The alternate base rate is the greatest of (a) the prime rate of a major United States financial institution, (b) the Federal Reserve Bank of New York rate plus 0.50% and (c) the adjusted Eurodollar rate plus 1.00%. The applicable margin for Eurodollar-based loans under the New Senior Secured Credit Facilities will be between 1.25% and 2.25% with respect to any loan under the Term Loan A Facility, 2.25% with respect to any loan under the Term Loan B Facility, and between 2.00% and 3.00% with respect to any loan under the Revolving Credit Facility. The applicable margin for loans subject to alternate base rate will be between 0.25% and 1.25% with respect to any loan under the Term Loan A Facility, 1.25% with respect to any loan under the Term Loan B Facility, and between 1.00% and 2.00% with respect to any loan under the Revolving Credit Facility.    
Line of Credit Facility, Borrowing Capacity, Description     The Credit Agreement permits AAM, Inc. to incur incremental term loan borrowings and/or increase commitments under the Revolving Credit Facility, subject to certain limitations and the satisfaction of certain conditions, in an aggregate amount not to exceed (i) $600 million, plus (ii) certain voluntary prepayments, plus (iii) additional amounts subject to pro forma compliance with a first lien net leverage ratio for Holdings and its restricted subsidiaries.    
Term Loan A [Member]          
Debt Instrument [Line Items]          
Payment for Debt Extinguishment or Debt Prepayment Cost   $ 5.0      
Term Loan B [Member]          
Debt Instrument [Line Items]          
Payment for Debt Extinguishment or Debt Prepayment Cost   15.5      
New Senior Secured Credit Facilities [Member]          
Debt Instrument [Line Items]          
Payments of Debt Issuance Costs     $ 53.6    
Metaldyne Performance Group, Inc. [Member] | Term Loan A [Member]          
Debt Instrument [Line Items]          
Proceeds from Issuance of Long-term Debt $ 100.0        
Metaldyne Performance Group, Inc. [Member] | Term Loan B [Member]          
Debt Instrument [Line Items]          
Proceeds from Issuance of Long-term Debt 1,550.0        
Metaldyne Performance Group, Inc. [Member] | New Multi-Currency Credit Facility [Member]          
Debt Instrument [Line Items]          
Long-term Line of Credit $ 900.0        
Metaldyne Performance Group, Inc. [Member] | 7.375% Notes - MPG [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 7.375%        
Revolving Credit Facility [Member]          
Debt Instrument [Line Items]          
Long-term Line of Credit   0.0 0.0   $ 0.0
Line of Credit Facility, Remaining Borrowing Capacity   869.8 869.8    
Line of Credit Facility, Standby Letters of Credit Issued Against the Facility   $ 30.2 $ 30.2