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Debt, Factoring and Customer Financing Arrangements - Senior Notes (Details) - USD ($)
6 Months Ended 12 Months Ended
Dec. 08, 2017
Nov. 24, 2017
Oct. 03, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]            
Loss on debt extinguishments       $ 72,300,000 $ 11,300,000 $ 0
Long-term Debt       $ 5,505,100,000    
Maximum percentage of proceeds for permitted restricted payments       50.00%    
Senior Notes | USD Senior Notes Due 2025            
Debt Instrument [Line Items]            
Face amount   $ 550,000,000        
Stated interest rate       5.875%    
Proceeds from debt issuance   $ 546,000,000        
Senior Notes | USD Senior Notes Due 2025, Tack-on Offering            
Debt Instrument [Line Items]            
Face amount $ 250,000,000          
Stated interest rate 5.875% 5.875%        
Proceeds from debt issuance $ 250,000,000          
Senior Notes | USD Senior Notes Due 2021            
Debt Instrument [Line Items]            
Stated interest rate 10.375% 10.375%   10.375%    
Loss on debt extinguishments $ 52,800,000          
Long-term Debt       $ 0    
Write off of debt issuance costs 9,100,000          
Tender offer premium 43,700,000          
Term Loans            
Debt Instrument [Line Items]            
Write off of debt issuance costs $ 2,700,000   $ 18,900,000