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Senior Secured Credit Facilities (Details) - USD ($)
$ in Millions
12 Months Ended
Apr. 06, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]        
Proceeds from Issuance of Long-term Debt   $ 509.6 $ 2,862.7 $ 30.3
Payments of Debt Issuance Costs   6.9 91.0 $ 0.0
Term Loan A [Member]        
Debt Instrument [Line Items]        
Payment for Debt Extinguishment or Debt Prepayment Cost   8.8    
Term Loan B [Member]        
Debt Instrument [Line Items]        
Payment for Debt Extinguishment or Debt Prepayment Cost   15.5    
Senior Secured Credit Facilities [Member]        
Debt Instrument [Line Items]        
Payments of Debt Issuance Costs     54.0  
Multi-Currency Credit Facility [Member]        
Debt Instrument [Line Items]        
Line of Credit Facility, Remaining Borrowing Capacity   894.7    
Letters of Credit Outstanding, Amount   37.3    
Revolving Credit Facility [Member]        
Debt Instrument [Line Items]        
Line of credit facility, amount outstanding   $ 0.0 $ 0.0  
Metaldyne Performance Group, Inc. [Member] | Multi-Currency Credit Facility [Member]        
Debt Instrument [Line Items]        
Line of credit facility, amount outstanding $ 932.0      
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