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Long-Term Debt - Receivable Financing Facility (Details) - USD ($)
Mar. 31, 2018
Dec. 01, 2017
Line of Credit Facility [Line Items]    
Accounts receivable pledged $ 351,000,000  
Secured Debt | Receivables Financing Facility    
Line of Credit Facility [Line Items]    
Receivable financing facility, up to   $ 180,000,000
Pledged associated liabilities $ 86,000,000  
Average interest rate 2.72%