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Long-Term Debt Notes Payable (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jun. 30, 2018
Mar. 31, 2018
Mar. 31, 2017
Debt Instrument [Line Items]            
Payments of Debt Issuance Costs $ 6.9 $ 91.0 $ 0.0      
Other expense - Debt refinancing and redemption costs 19.4 3.5 0.0      
Repayments of Long-term Debt $ 681.2 2,154.4 $ 7.0      
7.75% Notes [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Interest Rate, Stated Percentage 7.75%          
6.625% Notes [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Interest Rate, Stated Percentage       6.625%    
6.25% Notes Due 2025 & 6.50% Notes Due 2027 [Member]            
Debt Instrument [Line Items]            
Payments of Debt Issuance Costs   37.2        
6.25% Notes Due 2026 [Member]            
Debt Instrument [Line Items]            
Payments of Debt Issuance Costs $ 6.6          
Debt Instrument, Interest Rate, Stated Percentage         6.25%  
6.25% Notes due 2021 [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Interest Rate, Stated Percentage         6.25%  
Secured Debt [Member] | Term Loan A [Member]            
Debt Instrument [Line Items]            
Long-term debt 83.8 92.5        
Secured Debt [Member] | Term Loan B [Member]            
Debt Instrument [Line Items]            
Long-term debt 1,511.2 1,526.8        
Unsecured Debt [Member] | 7.75% Notes [Member]            
Debt Instrument [Line Items]            
Long-term debt $ 100.0 200.0        
Debt Instrument, Interest Rate, Stated Percentage 7.75%          
Debt Instrument, Repurchase Amount $ 100.0          
Write off of Deferred Debt Issuance Cost 0.3          
Interest Paid, Including Capitalized Interest, Operating and Investing Activities 3.9          
Redemption Premium 4.5          
Unsecured Debt [Member] | 6.625% Notes [Member]            
Debt Instrument [Line Items]            
Long-term debt $ 450.0 550.0        
Debt Instrument, Interest Rate, Stated Percentage 6.625%          
Debt Instrument, Repurchase Amount       $ 100.0    
Write off of Deferred Debt Issuance Cost $ 0.8          
Interest Paid, Including Capitalized Interest, Operating and Investing Activities 0.8          
Redemption Premium 3.3          
Unsecured Debt [Member] | 6.50% Notes [Member]            
Debt Instrument [Line Items]            
Long-term debt $ 500.0 500.0       $ 500.0
Debt Instrument, Interest Rate, Stated Percentage 6.50%         6.50%
Unsecured Debt [Member] | 6.25% Notes Due 2026 [Member]            
Debt Instrument [Line Items]            
Long-term debt $ 400.0 0.0     $ 400.0  
Debt Instrument, Interest Rate, Stated Percentage 6.25%          
Unsecured Debt [Member] | 6.25% Notes due 2025 [Member]            
Debt Instrument [Line Items]            
Long-term debt $ 700.0 700.0       $ 700.0
Debt Instrument, Interest Rate, Stated Percentage 6.25%         6.25%
Unsecured Debt [Member] | 6.25% Notes due 2021 [Member]            
Debt Instrument [Line Items]            
Long-term debt $ 0.0 400.0        
Debt Instrument, Repurchase Amount         $ 400.0  
Write off of Deferred Debt Issuance Cost 2.5          
Gain (Loss) on Extinguishment of Debt, before Write off of Debt Issuance Cost $ 8.0          
Metaldyne Performance Group, Inc. [Member]            
Debt Instrument [Line Items]            
Write off of Deferred Debt Issuance Cost   2.7        
Proceeds from Notes Payable   $ 1,200.0        
Metaldyne Performance Group, Inc. [Member] | Unsecured Debt [Member] | 6.50% Notes [Member]            
Debt Instrument [Line Items]            
Long-term debt           $ 500.0
Debt Instrument, Interest Rate, Stated Percentage           6.50%
Metaldyne Performance Group, Inc. [Member] | Unsecured Debt [Member] | 6.25% Notes due 2025 [Member]            
Debt Instrument [Line Items]            
Long-term debt           $ 700.0
Debt Instrument, Interest Rate, Stated Percentage           6.25%