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Goodwill and Intangible Assets - Amortization on Intangible Assets (Detail) - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Goodwill And Intangible Assets Disclosure [Abstract]      
Amortization of intangible assets $ 61.0 $ 59.3 $ 37.3