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Accounts Receivable (Details) - USD ($)
 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Receivables [Abstract]    
Authorized amount of receivables sold under RPAs $ 725,000,000.0  
Accounts receivable sold under RPAs 6,100,000,000 $ 4,600,000,000
Amount collected of accounts receivables under repurchase agreement 6,000,000,000.0 4,500,000,000
Fees and financing costs under the RPA 14,200,000 8,700,000
Account receivable sold $ 553,700,000 $ 377,300,000