Quarterly report pursuant to Section 13 or 15(d)

Service Revenue (Summary of Disaggregates Revenue by Services) (Details)

v3.19.3
Service Revenue (Summary of Disaggregates Revenue by Services) (Details) - USD ($)
$ in Millions
3 Months Ended
Aug. 31, 2019
Aug. 31, 2018
Disaggregation of Revenue [Line Items]    
Total service revenue $ 971.5 $ 845.7
Management Solutions [Member]    
Disaggregation of Revenue [Line Items]    
Total service revenue 724.5 687.7
PEO And Insurance Services [Member]    
Disaggregation of Revenue [Line Items]    
Total service revenue $ 247.0 $ 158.0