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New Senior Secured Credit Facilities Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Apr. 06, 2017
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Debt Instrument [Line Items]        
Proceeds from Issuance of Long-term Debt   $ 431.4 $ 1,209.4  
Secured Debt, Current   31.8   $ 5.9
Term Loan A [Member]        
Debt Instrument [Line Items]        
Payment for Debt Extinguishment or Debt Prepayment Cost   3.8    
Term Loan B [Member]        
Debt Instrument [Line Items]        
Payment for Debt Extinguishment or Debt Prepayment Cost   11.6    
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      
Secured Debt [Member] | Term Loan A & Term Loan B [Domain]        
Debt Instrument [Line Items]        
Secured Debt, Current   5.0    
Revolving Credit Facility [Member]        
Debt Instrument [Line Items]        
Long-term Line of Credit   0.0   $ 0.0
Line of Credit Facility, Remaining Borrowing Capacity   865.3    
Line of Credit Facility, Standby Letters of Credit Issued Against the Facility   $ 34.7