Quarterly report pursuant to Section 13 or 15(d)

Funds Held for Clients and Corporate Investments (Classification of Investments on Consolidated Balance Sheets) (Details)

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Funds Held for Clients and Corporate Investments (Classification of Investments on Consolidated Balance Sheets) (Details) - USD ($)
$ in Millions
Aug. 31, 2019
May 31, 2019
Funds Held for Clients and Corporate Investments [Abstract]    
Funds held for clients $ 3,769.1 $ 3,803.8
Corporate investments 40.9 39.0
Long-term corporate investments 10.3 10.2
Total funds held for clients and corporate investments, Fair value $ 3,820.3 $ 3,853.0