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Revenue Recognition - Topic 606 Disclosure of Impact of Adoption to Condensed Consolidated Balance Sheets (Detail) - USD ($)
$ in Millions
Sep. 30, 2018
Jun. 30, 2018
Revenue Initial Application Period Cumulative Effect Transition [Line Items]    
Accounts receivable, net $ 332.6 $ 289.1
Total assets 1,524.8 1,499.8
Other accrued liabilities 101.0 79.7
Total liabilities and stockholders' equity 1,524.8 $ 1,499.8
Adjustments [Member] | Topic 606 [Member]    
Revenue Initial Application Period Cumulative Effect Transition [Line Items]    
Accounts receivable, net (4.8)  
Total assets (4.8)  
Other accrued liabilities (4.8)  
Total liabilities and stockholders' equity (4.8)  
Proforma as if previous standard was in effect [Member] | Topic 606 [Member]    
Revenue Initial Application Period Cumulative Effect Transition [Line Items]    
Accounts receivable, net 327.8  
Total assets 1,520.0  
Other accrued liabilities 96.2  
Total liabilities and stockholders' equity $ 1,520.0