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Goodwill and Intangible Assets - Amortization on Intangible Assets (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Goodwill And Intangible Assets Disclosure [Abstract]        
Amortization of intangible assets $ 15.2 $ 15.4 $ 30.5 $ 28.8