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Long-Term Debt - Revolving Loan (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]        
Debt, long-term and short-term   $ 3,255.9 $ 3,267.8  
Net loss on extinguishments of long-term debt   (57.4) (2.1) $ (24.3)
Senior secured asset-based revolving credit facility        
Debt Instrument [Line Items]        
Debt, long-term and short-term   0.0 0.0  
Additional borrowing capacity   996.0    
Undrawn letters of credit   1.0    
Borrowing base   1,600.0    
Cash availability. minimum liquidity   $ 125.0    
Cash availability, percentage of borrowing base   10.00%    
Minimum liquidity, amount   $ 100.0    
Basis spread on variable rate (as percent)   1.00%    
Debt instrument term 5 years      
Borrowing capacity of the Revolving Loan $ 1,500.0   $ 1,250.0  
Maximum aggregate increase $ 300.0      
Unused borrowing capacity 0.25%      
Margin on borrowings, reduced interest rate from refinancing in bps 0.25%      
Net loss on extinguishments of long-term debt   $ (1.0)    
Capitalized fees as deferred financing costs   $ 4.0    
Senior secured asset-based revolving credit facility | Minimum        
Debt Instrument [Line Items]        
Consolidated fixed charge coverage ratio   1    
Senior secured asset-based revolving credit facility | Accounts Payable, Inventory Financing        
Debt Instrument [Line Items]        
Amount owed under Revolving loan financing agreement   $ 454.0    
Senior secured asset-based revolving credit facility | Federal Funds Rate        
Debt Instrument [Line Items]        
Basis spread on variable rate (as percent)   0.50%    
Senior secured asset-based revolving credit facility | LIBOR | Minimum        
Debt Instrument [Line Items]        
Basis spread on variable rate (as percent)   1.25%    
Senior secured asset-based revolving credit facility | LIBOR | Maximum        
Debt Instrument [Line Items]        
Basis spread on variable rate (as percent)   1.75%    
Senior secured asset-based revolving credit facility | ABR | Minimum        
Debt Instrument [Line Items]        
Basis spread on variable rate (as percent)   0.25%    
Senior secured asset-based revolving credit facility | ABR | Maximum        
Debt Instrument [Line Items]        
Basis spread on variable rate (as percent)   0.75%