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Supplemental Cash Flow Information - Schedule of Supplemental Cash Flow Information (Detail) - USD ($)
$ in Millions
 6 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Jul. 01, 2019
Cash paid during the period for income taxes   $ 5.3  
Cash paid for interest $ 5.2 $ 4.4  
Establishment of operating lease right-of-use assets and lease liabilities      
Operating lease right-of-use assets 67.3    
Accrued liabilities and other long-term liabilities 4.3    
ASU 2016-02      
Establishment of operating lease right-of-use assets and lease liabilities      
Operating lease right-of-use assets 74.5   $ 74.5
Operating lease liabilities $ (78.8)   $ (78.8)