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Accrued Expenses and Other Liabilities (Detail) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Accrued Liabilities and Other Liabilities [Abstract]    
Accrued products and licenses costs $ 88.6 $ 74.5
Marketing expenses payable 6.3 10.1
Legal accrual 40.2 46.5
Other accrued expenses 42.9 42.9
Accrued expenses and other liabilities total $ 178.0 $ 174.0