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Long-Term Debt Long-Term Debt Notes Payable (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2013
Debt Instrument [Line Items]            
Payments of Debt Issuance Costs     $ 91.0 $ 0.0 $ 0.0  
Repayments of Long-term Debt     2,154.4 7.0 157.0  
Other expense - Debt refinancing and redemption costs     3.5 0.0 $ 0.8  
Write off of Deferred Debt Issuance Cost     2.7      
6.25% Notes Due 2025 & 6.50% Notes Due 2027 [Member]            
Debt Instrument [Line Items]            
Payments of Debt Issuance Costs     37.2      
Unsecured Debt [Member] | 6.25% Notes due 2025 [Member]            
Debt Instrument [Line Items]            
Long-term debt $ 700.0   $ 700.0 0.0    
Debt Instrument, Interest Rate, Stated Percentage 6.25%   6.25%      
Unsecured Debt [Member] | 5.125% Notes [Member]            
Debt Instrument [Line Items]            
Long-term debt $ 0.0   $ 0.0 200.0   $ 200.0
Debt Instrument, Repurchased Face Amount $ 200.0   $ 200.0      
Debt Instrument, Interest Rate, Stated Percentage 5.125%   5.125%      
Interest Paid $ 3.1          
Write off of Deferred Debt Issuance Cost 0.8          
Unsecured Debt [Member] | 7.75% Notes [Member]            
Debt Instrument [Line Items]            
Long-term debt $ 200.0   $ 200.0 200.0    
Debt Instrument, Interest Rate, Stated Percentage 7.75%   7.75%      
Unsecured Debt [Member] | 6.625% Notes [Member]            
Debt Instrument [Line Items]            
Long-term debt $ 550.0   $ 550.0 550.0    
Debt Instrument, Interest Rate, Stated Percentage 6.625%   6.625%      
Unsecured Debt [Member] | 6.50% Notes [Member]            
Debt Instrument [Line Items]            
Long-term debt $ 500.0   $ 500.0 $ 0.0    
Debt Instrument, Interest Rate, Stated Percentage 6.50%   6.50%      
Metaldyne Performance Group, Inc. [Member]            
Debt Instrument [Line Items]            
Proceeds from Notes Payable   $ 1,200.0        
Interest Paid     $ 24.6      
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%        
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%   6.50%