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Senior Secured Credit Facilities Narrative (Details) - USD ($)
$ in Millions
6 Months Ended
Apr. 06, 2017
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Debt Instrument [Line Items]        
Proceeds from Issuance of Long-term Debt   $ 8.0 $ 461.9  
AAM Inc. [Member] | Term Loan A [Member]        
Debt Instrument [Line Items]        
Proceeds from Issuance of Long-term Debt $ 100.0      
AAM Inc. [Member] | Term Loan B [Member]        
Debt Instrument [Line Items]        
Proceeds from Issuance of Long-term Debt 1,550.0      
AAM Inc. [Member] | Multi-Currency Credit Facility [Member]        
Debt Instrument [Line Items]        
Long-term Line of Credit $ 932.0      
Revolving Credit Facility [Member]        
Debt Instrument [Line Items]        
Long-term Line of Credit   0.0   $ 0.0
Line of Credit Facility, Remaining Borrowing Capacity   894.3    
Line of Credit Facility, Standby Letters of Credit Issued Against the Facility   $ 37.7