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Senior Secured Credit Facilities Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Apr. 06, 2017
Sep. 30, 2019
Sep. 30, 2019
Sep. 30, 2018
Jul. 29, 2019
Dec. 31, 2018
Debt Instrument [Line Items]            
Proceeds from Issuance of Long-term Debt     $ 348.4 $ 481.3    
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          
Secured Debt [Member] | Term Loan A [Member]            
Debt Instrument [Line Items]            
Long-term Debt           $ 83.8
Secured Debt [Member] | Term Loan B [Member]            
Debt Instrument [Line Items]            
Long-term Debt   $ 1,248.6 1,248.6     1,511.2
Secured Debt [Member] | Term Loan A Due 2024 [Member]            
Debt Instrument [Line Items]            
Long-term Debt   340.0 340.0   $ 340.0  
Secured Debt [Member] | Term Loan A & Term Loan B [Member]            
Debt Instrument [Line Items]            
Write off of Deferred Debt Issuance Cost   5.1        
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   890.8 890.8      
Line of Credit Facility, Standby Letters of Credit Issued Against the Facility   $ 34.2 $ 34.2