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Acquisitions and Channel Partner Arrangements (Narrative) (Details) - USD ($)
1 Months Ended 12 Months Ended
Nov. 28, 2016
Sep. 30, 2017
Jan. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Aug. 01, 2016
Business Acquisition [Line Items]            
Debt, maximum allowed borrowing capacity           $ 250,000,000.0
Payment for acquisition of client contracts       $ 21,100,000 $ 400,000  
ADP/COBRA/CHSA            
Business Acquisition [Line Items]            
Payments to acquire businesses, gross $ 235,000,000          
Proceeds from long-term lines of credit $ 169,900,000          
Ceridian Channel Partner Arrangement            
Business Acquisition [Line Items]            
Purchase price of acquisition     $ 13,500,000      
Tango Health [Member]            
Business Acquisition [Line Items]            
Asset Acquisition, Purchase Price   $ 4,100,000        
Contingent consideration recorded   $ 2,100,000