XML 65 R50.htm IDEA: XBRL DOCUMENT v3.10.0.1
Accounts Receivable (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Revenue, Performance Obligation, Description of Payment Terms 50 days  
Allowance for doubtful accounts receivable $ 8.4 $ 7.0