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Business combination (Narrative) (Details) - Wage Works Inc.
$ / shares in Units, $ in Millions
Aug. 30, 2019
USD ($)
$ / shares
Business Acquisition [Line Items]  
Merger related costs, price per share | $ / shares $ 51.35
Aggregate fair value of WageWorks stock acquired $ 2,000.0
Cash paid 816.9
Borrowing pursuant to term loan facility 1,220.0
Line of Credit | Term Loan Facility  
Business Acquisition [Line Items]  
Cash paid $ 30.5