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Detail of Certain Balance Sheet Accounts - Additional Information (Detail) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Balance Sheet Related Disclosures [Abstract]    
Deferred compensation plan assets $ 38.1 $ 38.9
Deferred tax assets 66.4 79.3
Deferred compensation plan liabilities 63.4 62.4
Deferred income tax liabilities $ 21.1 $ 21.4