Annual report pursuant to Section 13 and 15(d)

Goodwill and Intangible Assets, Net of Accumulated Amortization (Narrative) (Details)

v3.20.2
Goodwill and Intangible Assets, Net of Accumulated Amortization (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
May 31, 2020
May 31, 2019
May 31, 2018
Goodwill and Intangible Assets [Line Items]      
Amortization expense $ 81.9 $ 55.8 $ 21.1
Impairment loss relates to goodwill or intangible assets $ 0.0 $ 0.0 $ 0.0
Client Lists [Member]      
Goodwill and Intangible Assets [Line Items]      
Acquired intangible assets with weighted-average amortization periods 7 years 8 months 12 days