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Commitments and Contingencies - Receivable Purchase Agreement (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Sep. 30, 2018
Commitments and Contingencies    
Trade receivables from customers without recourse to be sold, maximum amount $ 23.0 $ 23.0
Receivable Purchase Agreement, term 1 year  
Trade receivables, sold   $ 0.0