Annual report pursuant to Section 13 and 15(d)

Detail of Certain Balance Sheet Accounts - Additional Information (Detail)

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Detail of Certain Balance Sheet Accounts - Additional Information (Detail) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Balance Sheet Related Disclosures [Abstract]    
Deferred compensation plan assets $ 38.9 $ 31.2
Deferred tax assets 79.3 79.1
Deferred compensation plan liabilities 62.4 51.3
Deferred income tax liabilities $ 21.4 $ 7.5