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New Senior Secured Credit Facilities Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Apr. 06, 2017
Jun. 30, 2018
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Debt Instrument [Line Items]          
Proceeds from Issuance of Long-term Debt     $ 461.9 $ 2,857.9  
Long-term Debt, Current Maturities   $ 33.2 33.2   $ 5.9
Term Loan A [Member]          
Debt Instrument [Line Items]          
Payment for Debt Extinguishment or Debt Prepayment Cost   2.5      
Term Loan B [Member]          
Debt Instrument [Line Items]          
Payment for Debt Extinguishment or Debt Prepayment Cost   7.8      
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 $ 932.0        
Secured Debt [Member] | Term Loan A & Term Loan B [Domain]          
Debt Instrument [Line Items]          
Long-term Debt, Current Maturities   11.5 11.5    
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   896.5 896.5    
Line of Credit Facility, Standby Letters of Credit Issued Against the Facility   $ 35.5 $ 35.5