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Debt, Factoring and Customer Financing Arrangements - Covenants, Events of Default and Provisions (Details) - Revolving Credit Facility
$ in Millions
12 Months Ended
Dec. 31, 2017
USD ($)
Debt Instrument [Line Items]  
Ratio of debt to EBITDA 6.25
Prepayment covenant percentage 75.00%
Prepayment covenant percentage, step-down 1 50.00%
Prepayment covenant percentage, step-down 2 25.00%
Prepayment covenant percentage, step-down 3 0.00%
Indebtedness yield increase 0.50%
Additional loan yield minimum 0.50%
Current borrowing capacity $ 481