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Senior Secured Credit Facilities Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Jul. 29, 2019
Apr. 06, 2017
Debt Instrument [Line Items]            
Proceeds from Revolving Credit Facility   $ 200.0 $ 0.0      
Revolving Credit Facility [Member]            
Debt Instrument [Line Items]            
Long-term Line of Credit         $ 925.0 $ 932.0
Revolving Credit Facility [Member] | Subsequent Event [Member]            
Debt Instrument [Line Items]            
Proceeds from Revolving Credit Facility $ 150.0          
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   340.0   340.0 $ 340.0  
Revolving Credit Facility [Member]            
Debt Instrument [Line Items]            
Long-term Line of Credit   200.0   $ 0.0    
Line of Credit Facility, Remaining Borrowing Capacity   691.4        
Line of Credit Facility, Standby Letters of Credit Issued Against the Facility   $ 33.6        
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]            
Long-term Line of Credit           $ 932.0