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Revenue Recognition - Topic 606 Disclosure of Impact of Adoption to Condensed Consolidated Statement of Cash Flows (Detail) - USD ($)
$ in Millions
6 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Cash flows from operating activities:    
Accounts receivable, net $ (31.7) $ 30.0
Other accrued liabilities 6.5 $ (6.6)
Adjustments [Member] | Topic 606 [Member]    
Cash flows from operating activities:    
Accounts receivable, net (0.1)  
Other accrued liabilities 0.1  
Proforma as if previous standard was in effect [Member] | Topic 606 [Member]    
Cash flows from operating activities:    
Accounts receivable, net (31.8)  
Other accrued liabilities $ 6.6