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Senior Secured Credit Facilities Narrative (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Jul. 29, 2019
Apr. 06, 2017
Debt Instrument [Line Items]          
Payments of Debt Issuance Costs $ 11.0 $ 3.3      
Revolving Credit Facility [Member]          
Debt Instrument [Line Items]          
Line of Credit Facility, Maximum Borrowing Capacity       $ 925.0 $ 932.0
Second Amendment to the Credit Agreement [Member]          
Debt Instrument [Line Items]          
Payments of Debt Issuance Costs 4.6        
Revolving Credit Facility [Member]          
Debt Instrument [Line Items]          
Line of Credit Facility, Remaining Borrowing Capacity 891.4        
Line of Credit Facility, Standby Letters of Credit Issued Against the Facility 33.6        
Secured Debt [Member] | Term Loan B [Member]          
Debt Instrument [Line Items]          
Long-term Debt 1,188.8   $ 1,188.8    
Secured Debt [Member] | Term Loan A Due 2024 [Member]          
Debt Instrument [Line Items]          
Long-term Debt $ 337.9   $ 340.0 $ 340.0  
AAM Inc. [Member] | Term Loan A [Member]          
Debt Instrument [Line Items]          
Long-term Debt         100.0
AAM Inc. [Member] | Term Loan B [Member]          
Debt Instrument [Line Items]          
Long-term Debt         1,550.0
AAM Inc. [Member] | Revolving Credit Facility [Member]          
Debt Instrument [Line Items]          
Line of Credit Facility, Maximum Borrowing Capacity         $ 932.0