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New Senior Secured Credit Facilities Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Apr. 06, 2017
Sep. 30, 2018
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Debt Instrument [Line Items]          
Proceeds from Issuance of Long-term Debt     $ 481.3 $ 2,858.1  
Long-term Debt, Current Maturities   $ 16.5 16.5   $ 5.9
Term Loan A [Member]          
Debt Instrument [Line Items]          
Payment for Debt Extinguishment or Debt Prepayment Cost   10.0      
Term Loan B [Member]          
Debt Instrument [Line Items]          
Payment for Debt Extinguishment or Debt Prepayment Cost   19.4      
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        
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   895.7 895.7    
Line of Credit Facility, Standby Letters of Credit Issued Against the Facility   $ 36.3 $ 36.3