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Long-Term Debt - Senior Secured Credit Facilities (Details) - USD ($)
$ in Millions
12 Months Ended
Apr. 06, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jul. 29, 2019
Debt Instrument [Line Items]          
Proceeds from Issuance of Long-term Debt   $ 356.3 $ 509.6 $ 2,862.7  
Multi-Currency Credit Facility [Member]          
Debt Instrument [Line Items]          
Line of Credit Facility, Maximum Borrowing Capacity $ 932.0       $ 925.0
Multi-Currency Credit Facility [Member]          
Debt Instrument [Line Items]          
Line of Credit Facility, Remaining Borrowing Capacity   898.8      
Letters of Credit Outstanding, Amount   26.2      
Secured Debt [Member] | Term Loan A [Member]          
Debt Instrument [Line Items]          
Long-term debt     83.8    
Secured Debt [Member] | Term Loan B [Member]          
Debt Instrument [Line Items]          
Long-term debt   1,188.8 $ 1,511.2    
Write off of Deferred Debt Issuance Cost   1.0      
Debt Instrument, Repurchase Amount   59.8      
Interest Paid, Including Capitalized Interest, Operating and Investing Activities   0.4      
Secured Debt [Member] | Term Loan A Due 2024 [Member]          
Debt Instrument [Line Items]          
Long-term debt   340.0     $ 340.0
Secured Debt [Member] | Term Loan A & Term Loan B [Member]          
Debt Instrument [Line Items]          
Write off of Deferred Debt Issuance Cost   $ 5.1      
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] | Multi-Currency Credit Facility [Member]          
Debt Instrument [Line Items]          
Line of Credit Facility, Maximum Borrowing Capacity $ 932.0