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Goodwill and Intangible Assets, Net of Accumulated Amortization (Change in Goodwill) (Details)
$ in Millions
6 Months Ended
Nov. 30, 2019
USD ($)
Goodwill and Intangible Assets, Net of Accumulated Amortization [Abstract]  
Goodwill Balance, beginning of period $ 1,782.6
Changes during the period:  
Goodwill acquired
Acquisition accounting adjustments 4.5
Currency translation adjustment (1.3)
Goodwill Balance, end of period $ 1,785.8