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Product Warranties - Product Warranty Activities (Parenthetical) (Detail) - USD ($)
$ in Millions
Jun. 30, 2020
Jun. 30, 2019
Other Current Liabilities [Member]    
Product Warranty Liability [Line Items]    
Short-term product warranty $ 12.4 $ 12.9
Other Noncurrent Liabilities [Member]    
Product Warranty Liability [Line Items]    
Long-term product warranty $ 3.3 $ 3.2